diff --git a/README.md b/README.md
index f48776f..f81e8d5 100644
--- a/README.md
+++ b/README.md
@@ -8,7 +8,7 @@ pip install boggler
 
 To use the script to solve a particular Boggle board configuration, you'll need to do a few things
 1. Create `.csv` of the board state like so:
-    
+
     Here is an example `board.csv`. Note the orientation of the board does not matter.
     ```console
     $ cat board.csv
@@ -45,7 +45,7 @@ To use the script to solve a particular Boggle board configuration, you'll need
 
     To split an English wordlist the `split_wordlist_alpha.sh` script can be used like so:
     ```console
-    $ split_wordlist_alpha.sh my_wordlist.txt . 
+    $ split_wordlist_alpha.sh my_wordlist.txt .
     ```
     This will generate a series of sub-dictionaries for each letter in the alphabet in the current directory.
     ```console
diff --git a/boggler/__main__.py b/boggler/__main__.py
index 8160175..432dacf 100755
--- a/boggler/__main__.py
+++ b/boggler/__main__.py
@@ -9,33 +9,58 @@ from rich.table import Table
 from rich import box
 from .boggler_utils import BoggleBoard, build_full_boggle_tree, read_boggle_file
 
-parser = argparse.ArgumentParser(
-    prog="boggler",
-    description="Boggle board game solver"
-)
+parser = argparse.ArgumentParser(prog="boggler", description="Boggle board game solver")
 
 parser.add_argument("board", type=Path, help="Path to board CSV file")
-parser.add_argument("wordlists", type=Path,
-    help="Path to directory of wordlist files. The directory must contain \
-        text files of the form words_X.txt where \"X\" is a character of \
-        the alphabet")
-parser.add_argument("max_word_length", nargs="?", type=int, default=16,
-    help="Maximum length of words searched for on provided board")
-parser.add_argument("-f", "--format", type=str,
-    help="Specify alternative output format including [txt, json]")
-parser.add_argument("-p", "--include-path", action="store_true", default=False,
-    help="Include full paths for each word in output")
-parser.add_argument("-s", "--sort", action="store_true", default=False,
+parser.add_argument(
+    "wordlists",
+    type=Path,
+    help='Path to directory of wordlist files. The directory must contain \
+        text files of the form words_X.txt where "X" is a character of \
+        the alphabet',
+)
+parser.add_argument(
+    "max_word_length",
+    nargs="?",
+    type=int,
+    default=16,
+    help="Maximum length of words searched for on provided board",
+)
+parser.add_argument(
+    "-f",
+    "--format",
+    type=str,
+    help="Specify alternative output format including [txt, json]",
+)
+parser.add_argument(
+    "-p",
+    "--include-path",
+    action="store_true",
+    default=False,
+    help="Include full paths for each word in output",
+)
+parser.add_argument(
+    "-s",
+    "--sort",
+    action="store_true",
+    default=False,
     help="Sort output alphabetically. By default the results are sorted by the starting \
           block position on the board from top-to-bottom, left-to-right as given in the \
-          board file.")
-parser.add_argument("-d", "--dedup", action="store_true", default=False,
+          board file.",
+)
+parser.add_argument(
+    "-d",
+    "--dedup",
+    action="store_true",
+    default=False,
     help="Remove duplicates from word-only output. Note that de-duplication does not preserve \
           the original order of the output, so it is recommended to also use the sort option when \
-          de-duplicating.")
+          de-duplicating.",
+)
 
 args = parser.parse_args()
 
+
 def main():
     """Command line tool for sovling Boggle boards"""
     board = read_boggle_file(args.board)
@@ -50,7 +75,9 @@ def main():
     if args.format:
         match args.format.lower():
             case "txt":
-                word_paths = [start_block.word_paths for start_block in boggle_tree.values()]
+                word_paths = [
+                    start_block.word_paths for start_block in boggle_tree.values()
+                ]
                 data = list(chain(*word_paths))
                 if args.include_path:
                     data = [f"{line[0]} {line[1]}" for line in data]
@@ -66,10 +93,10 @@ def main():
                     print(line)
 
             case "json":
-                data = { str(k):v.word_paths for k,v in boggle_tree.items()}
+                data = {str(k): v.word_paths for k, v in boggle_tree.items()}
                 print(json.dumps(data, indent=2, sort_keys=True))
             case _:
-                print(f"Invalid format (-f) option provided: \"{args.format}\"")
+                print(f'Invalid format (-f) option provided: "{args.format}"')
                 sys.exit()
 
     else:
@@ -83,18 +110,16 @@ def main():
                 show_header=True,
                 header_style="bold purple",
                 row_styles=["dim", ""],
-                box=box.ROUNDED
+                box=box.ROUNDED,
             )
             table.add_column("Word")
             table.add_column("Path")
             for word in tree.word_paths:
-                #print(f"{word[0]: <{boggle_board.max_word_len}}: {word[1]}")
-                table.add_row(
-                    f"{word[0]}",
-                    f"{word[1]}"
-                )
+                # print(f"{word[0]: <{boggle_board.max_word_len}}: {word[1]}")
+                table.add_row(f"{word[0]}", f"{word[1]}")
 
             console.print(table)
 
-if __name__ == '__main__':
+
+if __name__ == "__main__":
     main()
diff --git a/boggler/board_randomizer.py b/boggler/board_randomizer.py
index 859b037..6c81424 100755
--- a/boggler/board_randomizer.py
+++ b/boggler/board_randomizer.py
@@ -1,21 +1,25 @@
-'''Module to generate random Boggle boards for testing'''
+"""Module to generate random Boggle boards for testing"""
 from sys import argv, stderr
 from random import randint, shuffle
 from math import sqrt, floor
 from pathlib import Path
 
+
 def read_dice_file(dice_path: Path):
-    '''Return list of die strings from file ignoring all comments (#)'''
-    with open(dice_path, 'r+', encoding="utf-8") as file:
-        return [line.rstrip().split(',') for line in file.readlines() if line[0] != "#"]
+    """Return list of die strings from file ignoring all comments (#)"""
+    with open(dice_path, "r+", encoding="utf-8") as file:
+        return [line.rstrip().split(",") for line in file.readlines() if line[0] != "#"]
+
 
 def roll_die(die: str):
-    '''Return a face of the given die string to simulate rolling a die'''
+    """Return a face of the given die string to simulate rolling a die"""
     return str(die[randint(0, len(die) - 1)])
 
+
 def roll_dice(dice: list[str]):
-    '''Return a random roll for each die'''
-    return [ roll_die(die) for die in dice ]
+    """Return a random roll for each die"""
+    return [roll_die(die) for die in dice]
+
 
 def get_random_board(dice: list[str]):
     shuffle(dice)
@@ -25,17 +29,19 @@ def get_random_board(dice: list[str]):
     board_size = int(floor(sqrt(len(rolls))))
     board = []
     for i in range(0, len(dice), board_size):
-        board.append(rolls[i:i+board_size])
+        board.append(rolls[i : i + board_size])
     return board
 
+
 def get_random_board_csv(dice: list[str]):
     board = get_random_board(dice)
     board = [",".join(row) for row in board]
     return board
 
-if __name__ == '__main__':
+
+if __name__ == "__main__":
     if len(argv) != 2:
-        print('Usage: python3 board_randomizer.py <dice_file>')
+        print("Usage: python3 board_randomizer.py <dice_file>")
     else:
         try:
             dice = read_dice_file(Path(argv[1]))
diff --git a/boggler/boggler_utils.py b/boggler/boggler_utils.py
index b39d8c8..2c7e18a 100755
--- a/boggler/boggler_utils.py
+++ b/boggler/boggler_utils.py
@@ -1,4 +1,4 @@
-'''Boggler Utils'''
+"""Boggler Utils"""
 from __future__ import annotations
 from pathlib import Path
 from multiprocessing import Pool
@@ -6,10 +6,13 @@ import logging as log
 import functools
 import operator
 
+
 class BoardCell:
-    '''Boggle Board cell'''
-    def __init__(self, row: int, col: int, letters: str,
-        adjacent_cells: list[BoardCell] = None) -> None:
+    """Boggle Board cell"""
+
+    def __init__(
+        self, row: int, col: int, letters: str, adjacent_cells: list[BoardCell] = None
+    ) -> None:
         self.__row: int = row
         self.__col: int = col
         self.__pos: tuple[int, int] = (self.__row, self.__col)
@@ -18,27 +21,27 @@ class BoardCell:
 
     @property
     def row(self) -> int:
-        '''Getter for row property'''
+        """Getter for row property"""
         return self.__row
 
     @property
     def col(self) -> int:
-        '''Getter for col property'''
+        """Getter for col property"""
         return self.__col
 
     @property
     def pos(self) -> tuple[int, int]:
-        '''Getter for pos property'''
+        """Getter for pos property"""
         return self.__pos
 
     @property
     def letters(self) -> str:
-        '''Getter for letter property'''
+        """Getter for letter property"""
         return self.__letters
 
     @property
     def adjacent_cells(self) -> list[BoardCell]:
-        '''Getter for adjacent_cells property'''
+        """Getter for adjacent_cells property"""
         return self.__adjacent_cells
 
     @adjacent_cells.setter
@@ -51,8 +54,10 @@ class BoardCell:
     def __repr__(self):
         return f"(BoardCell({self.__row}, {self.__col}): {self.__letters}"
 
+
 class BoggleBoard:
-    '''Boggle board structure'''
+    """Boggle board structure"""
+
     def __init__(self, board: list[list[str]], max_word_len: int = 14) -> None:
         self.__height: int = len(board)
         self.__width: int = len(board[0]) if self.__height > 0 else 0
@@ -75,7 +80,9 @@ class BoggleBoard:
     def __str__(self):
         flattened_board_list = [y for x in self.__board_list for y in x]
         max_len = len(max(flattened_board_list, key=len))
-        max_len = max_len + 1 if max_len % 2 == 0 else max_len + 2 # keep header_len odd
+        max_len = (
+            max_len + 1 if max_len % 2 == 0 else max_len + 2
+        )  # keep header_len odd
         header_len = self.__width * (max_len + 1) - 1
         head = "-" * header_len
         header = f"+{head}+\n"
@@ -90,53 +97,61 @@ class BoggleBoard:
 
     @property
     def height(self) -> int:
-        '''Getter for height property'''
+        """Getter for height property"""
         return self.__height
 
     @property
     def width(self) -> int:
-        '''Getter for width property'''
+        """Getter for width property"""
         return self.__width
 
     @property
     def max_word_len(self) -> int:
-        '''Getter for maximum word length property'''
+        """Getter for maximum word length property"""
         return self.__max_word_len
 
     @property
     def board(self) -> dict[tuple[int, int], BoardCell]:
-        '''Getter for board property'''
+        """Getter for board property"""
         return self.__board
 
     def __get_adjacent_indexes(self, row, col):
-        '''Return adjecency list for board of size `row x col`'''
+        """Return adjecency list for board of size `row x col`"""
         indexes = []
         if row > 0:
-            indexes.append((row-1, col)) # up
+            indexes.append((row - 1, col))  # up
             if col > 0:
-                indexes.append((row-1, col-1)) # up-left
+                indexes.append((row - 1, col - 1))  # up-left
             if col < self.width - 1:
-                indexes.append((row-1, col+1)) # up-right
+                indexes.append((row - 1, col + 1))  # up-right
         if row < self.height - 1:
-            indexes.append((row+1, col)) # down
+            indexes.append((row + 1, col))  # down
             if col > 0:
-                indexes.append((row+1, col-1)) # down-left
+                indexes.append((row + 1, col - 1))  # down-left
             if col < self.width - 1:
-                indexes.append((row+1, col+1)) # down-right
+                indexes.append((row + 1, col + 1))  # down-right
         if col > 0:
-            indexes.append((row, col-1)) # left
+            indexes.append((row, col - 1))  # left
         if col < self.width - 1:
-            indexes.append((row, col+1)) # right
+            indexes.append((row, col + 1))  # right
         return indexes
 
     def get_cell(self, row: int, col: int) -> BoardCell:
-        '''Return the value at the specified row x column'''
+        """Return the value at the specified row x column"""
         return self.__board[(row, col)]
 
+
 class WordNode:
-    '''A node describing a single letter in a WordTree.'''
-    def __init__(self, letters: str, is_word: bool = False, parent: WordNode = None,
-        children: dict[str, WordNode] = None, board_pos = (None, None)) -> None:
+    """A node describing a single letter in a WordTree."""
+
+    def __init__(
+        self,
+        letters: str,
+        is_word: bool = False,
+        parent: WordNode = None,
+        children: dict[str, WordNode] = None,
+        board_pos=(None, None),
+    ) -> None:
         self.__letters = letters
         self.__is_word = is_word
         self.__children = children if children is not None else {}
@@ -145,12 +160,12 @@ class WordNode:
 
     @property
     def letters(self) -> str:
-        '''Getter for letter property'''
+        """Getter for letter property"""
         return self.__letters
 
     @property
     def is_word(self) -> bool:
-        '''Getter for is_word property'''
+        """Getter for is_word property"""
         return self.__is_word
 
     @is_word.setter
@@ -159,26 +174,26 @@ class WordNode:
 
     @property
     def children(self) -> dict[str, WordNode]:
-        '''Getter for children property'''
+        """Getter for children property"""
         return self.__children
 
     @property
     def parent(self) -> WordNode:
-        '''Getter for parent property'''
+        """Getter for parent property"""
         return self.__parent
 
     @property
     def board_pos(self) -> tuple[int, int]:
-        '''Getter for board_pos property'''
+        """Getter for board_pos property"""
         return self.__board_pos
 
     def add_child_node(self, node):
-        '''Add child node to `children` dictionary, indexed by the nodes' `letter`'''
+        """Add child node to `children` dictionary, indexed by the nodes' `letter`"""
         self.children[node.letters] = node
 
     @property
     def path(self) -> list[WordNode]:
-        '''Return list of nodes from current node to the root'''
+        """Return list of nodes from current node to the root"""
         curr_node = self
         path = []
         path.append(curr_node.board_pos)
@@ -189,7 +204,7 @@ class WordNode:
         return path
 
     def get_word(self, board: BoggleBoard) -> str:
-        '''Return word or word fragment based on the WordNode's path property'''
+        """Return word or word fragment based on the WordNode's path property"""
         return "".join([board.board[x].letters for x in self.path[::-1]])
 
     def __str__(self):
@@ -198,10 +213,17 @@ class WordNode:
     def __repr__(self):
         return f"WordNode: {self.letters}, {self.is_word}, {self.children}"
 
+
 class WordTree:
-    '''A tree populated by WordNode(s) to complete words from a given root letter and wordlist'''
-    def __init__(self, alphabet: list[str], root: WordNode, words: list[str] = None,
-        max_word_len = 16) -> None:
+    """A tree populated by WordNode(s) to complete words from a given root letter and wordlist"""
+
+    def __init__(
+        self,
+        alphabet: list[str],
+        root: WordNode,
+        words: list[str] = None,
+        max_word_len=16,
+    ) -> None:
         self.__alphabet = alphabet
         self.__wordlist = words
         self.__root = root
@@ -220,32 +242,32 @@ class WordTree:
 
     @property
     def alphabet(self) -> list:
-        '''Getter for alphabet property'''
+        """Getter for alphabet property"""
         return self.__alphabet
 
     @property
     def wordlist(self) -> list[str]:
-        '''Getter for wordlist property'''
+        """Getter for wordlist property"""
         return self.__wordlist
 
     @property
     def root(self) -> WordNode:
-        '''Getter for root property'''
+        """Getter for root property"""
         return self.__root
 
     @property
     def max_word_len(self) -> int:
-        '''Getter for max_word_len property'''
+        """Getter for max_word_len property"""
         return self.__max_word_len
 
     @property
     def tree(self) -> dict[str, WordNode]:
-        '''Getter for tree property'''
+        """Getter for tree property"""
         return self.__tree
 
     @property
     def word_paths(self) -> dict[(int, int), WordNode]:
-        '''Getter for leaf_nodes property'''
+        """Getter for leaf_nodes property"""
         return self.__word_paths
 
     @word_paths.setter
@@ -258,19 +280,25 @@ class WordTree:
     def __repr__(self):
         return self.__str__()
 
-    def insert_node(self, letters: str, parent: WordNode, is_word: bool = False,
-        children: dict[str, WordNode] = None, board_pos = None):
-        '''Create WordNode for `letters` and into WordTree under `parent`'''
+    def insert_node(
+        self,
+        letters: str,
+        parent: WordNode,
+        is_word: bool = False,
+        children: dict[str, WordNode] = None,
+        board_pos=None,
+    ):
+        """Create WordNode for `letters` and into WordTree under `parent`"""
         log.debug("inserting node: %s", letters)
         node = WordNode(letters, is_word, parent, children, board_pos)
         parent.add_child_node(node)
 
     def __insert_word(self, word: str) -> bool:
-        '''Returns True if the word could be inserted into the tree with the given alphabet,
-        otherwise returns False'''
+        """Returns True if the word could be inserted into the tree with the given alphabet,
+        otherwise returns False"""
 
         # Insert root node
-        prefix = word[0:len(self.root.letters)] # prefix = first letter block
+        prefix = word[0 : len(self.root.letters)]  # prefix = first letter block
         if word is None or prefix != self.root.letters:
             return False
         curr_node = self.tree[prefix]
@@ -280,11 +308,18 @@ class WordTree:
         i_max = min(self.max_word_len, len(word))
         while i < i_max:
             letters = word[i]
-            log.debug("1 letter seq: %s %s %s", word, letters, letters in curr_node.children)
+            log.debug(
+                "1 letter seq: %s %s %s", word, letters, letters in curr_node.children
+            )
             if letters not in self.alphabet:
                 # Check two letter sequences like ("Qu", "Th", etc.) at current index
-                letters = word[i:i+2]
-                log.debug("2 letter seq: %s %s %s", word, letters, letters in curr_node.children)
+                letters = word[i : i + 2]
+                log.debug(
+                    "2 letter seq: %s %s %s",
+                    word,
+                    letters,
+                    letters in curr_node.children,
+                )
                 if letters not in self.alphabet:
                     return False
             # Insert node
@@ -300,8 +335,8 @@ class WordTree:
         curr_node.is_word = len(word) <= self.max_word_len
         return True
 
-    def search(self, word: str, curr_node = None) -> WordNode:
-        '''Return leaf (WordNode) if a given word is in the tree otherwise return None'''
+    def search(self, word: str, curr_node=None) -> WordNode:
+        """Return leaf (WordNode) if a given word is in the tree otherwise return None"""
         if len(word) == 0 or word is None:
             return curr_node
 
@@ -309,22 +344,33 @@ class WordTree:
         if curr_node is None:
             curr_node = self.root
         for letters in curr_node.children:
-            if letters == word[len(curr_node.letters):len(curr_node.letters) + len(letters)]:
-                return self.search(word[len(curr_node.letters):], curr_node.children[letters])
+            if (
+                letters
+                == word[len(curr_node.letters) : len(curr_node.letters) + len(letters)]
+            ):
+                return self.search(
+                    word[len(curr_node.letters) :], curr_node.children[letters]
+                )
 
         # Currently only returns single path for word
         # TODO: return all possible paths, maybe create minature WordTree? Or just of list of paths.
         return curr_node
 
-    def build_boggle_tree(self, board: BoggleBoard, board_cell: BoardCell, subtree: WordTree, word_len: int = 0) -> WordTree:
-        '''Return subtree of board given a particular root (first letter).
+    def build_boggle_tree(
+        self,
+        board: BoggleBoard,
+        board_cell: BoardCell,
+        subtree: WordTree,
+        word_len: int = 0,
+    ) -> WordTree:
+        """Return subtree of board given a particular root (first letter).
 
         Keyword arguments:
         board       -- the board the new tree is based on
         board_node  -- a pointer on the board where new branch nodes can be inserted into the tree
         dict_node   -- a pointer on the dictionary where nodes are read from for validation
         subtree     -- the partial tree passed to the next recursive step for generating branches
-        '''
+        """
 
         if word_len > self.max_word_len or word_len >= board.max_word_len:
             log.debug(f"MAX WORD LENGTH REACHED! len = {word_len}")
@@ -336,39 +382,68 @@ class WordTree:
         if self.active_node.is_word and len(self.active_node.children) == 0:
             word_path = subtree.active_node.path[::-1]
             subtree.word_paths.append((subtree.active_node.get_word(board), word_path))
-            log.debug("1: WORD FOUND: %s %s", "".join([board.board[x].letters for x in word_path]), word_path)
+            log.debug(
+                "1: WORD FOUND: %s %s",
+                "".join([board.board[x].letters for x in word_path]),
+                word_path,
+            )
             self.active_node = self.active_node.parent
             subtree.active_node = subtree.active_node.parent
             return subtree
         elif self.active_node.is_word:
             word_path = subtree.active_node.path[::-1]
             subtree.word_paths.append((subtree.active_node.get_word(board), word_path))
-            log.debug("2: WORD FOUND: %s %s", "".join([board.board[x].letters for x in word_path]), word_path)
+            log.debug(
+                "2: WORD FOUND: %s %s",
+                "".join([board.board[x].letters for x in word_path]),
+                word_path,
+            )
 
         # Branch for each adjacent board cell
         for cell in board_cell.adjacent_cells:
             # Check dictionary and exclude nodes already in path
-            if cell.letters in self.active_node.children and cell.pos not in subtree.active_node.path:
-                new_node = WordNode(cell.letters, self.active_node.is_word, subtree.active_node, board_pos = cell.pos)
+            if (
+                cell.letters in self.active_node.children
+                and cell.pos not in subtree.active_node.path
+            ):
+                new_node = WordNode(
+                    cell.letters,
+                    self.active_node.is_word,
+                    subtree.active_node,
+                    board_pos=cell.pos,
+                )
                 subtree.active_node.add_child_node(new_node)
-                subtree.active_node = subtree.active_node.children[cell.letters] # update subtree pointer
-                self.active_node = self.active_node.children[cell.letters] # update dictionary tree pointer
-                self.build_boggle_tree(board, board.board[cell.pos], subtree, word_len=word_len+len(board_cell.letters))
+                subtree.active_node = subtree.active_node.children[
+                    cell.letters
+                ]  # update subtree pointer
+                self.active_node = self.active_node.children[
+                    cell.letters
+                ]  # update dictionary tree pointer
+                self.build_boggle_tree(
+                    board,
+                    board.board[cell.pos],
+                    subtree,
+                    word_len=word_len + len(board_cell.letters),
+                )
 
         self.active_node = self.active_node.parent
         subtree.active_node = subtree.active_node.parent
         return subtree
 
+
 def build_boggle_tree(args):
-    '''Build boggle tree from arguments for process Pool'''
+    """Build boggle tree from arguments for process Pool"""
     (alphabet, board, cell, wordlist) = args
     root_node = WordNode(cell.letters)
     dict_tree = WordTree(alphabet, root_node, wordlist)
     sub_tree = WordTree(alphabet, WordNode(cell.letters, False, board_pos=cell.pos))
     return dict_tree.build_boggle_tree(board, cell, sub_tree)
 
-def build_full_boggle_tree(board: BoggleBoard, wordlist_path: Path) -> dict[str, WordTree]:
-    '''Return dictionary of WordTree(s) for every letter on a BoggleBoard'''
+
+def build_full_boggle_tree(
+    board: BoggleBoard, wordlist_path: Path
+) -> dict[str, WordTree]:
+    """Return dictionary of WordTree(s) for every letter on a BoggleBoard"""
     alphabet = sorted(set([cell.letters for cell in board.board.values()]))
     board_tree = {}
     index: dict[str] = {}
@@ -393,7 +468,9 @@ def build_full_boggle_tree(board: BoggleBoard, wordlist_path: Path) -> dict[str,
             index[letters] = {}
 
     log.info("Generating WordTrees...")
-    params = [ [alphabet, board, cell, index[cell.letters] ] for cell in board.board.values()]
+    params = [
+        [alphabet, board, cell, index[cell.letters]] for cell in board.board.values()
+    ]
     with Pool(processes=len(board.board)) as pool:
         for i, res in enumerate(pool.map(build_boggle_tree, params)):
             log.info(">> %s", params[i][2])
@@ -401,22 +478,25 @@ def build_full_boggle_tree(board: BoggleBoard, wordlist_path: Path) -> dict[str,
 
     return board_tree
 
+
 def read_wordlist(file):
-    '''Return dictionary of words with associated word count (1 by default)'''
-    with open(file, 'r', encoding='utf-8') as file:
+    """Return dictionary of words with associated word count (1 by default)"""
+    with open(file, "r", encoding="utf-8") as file:
         return file.read().split()
 
+
 class BadBoardFormat(Exception):
     pass
 
+
 def read_boggle_file(file):
-    '''Return list of rows from Boggle board csv file
+    """Return list of rows from Boggle board csv file
 
     The size of the board is determined by the width (number of comma-separated values)
         of the first (non-empty) line in the file.
-    
-    '''
-    with open(file, 'r', encoding='utf-8') as file:
+
+    """
+    with open(file, "r", encoding="utf-8") as file:
         board = []
 
         board.append([x.strip() for x in file.readline().split(",")])
@@ -425,7 +505,7 @@ def read_boggle_file(file):
             if line.strip() == "":
                 raise BadBoardFormat("board files must contain no blank lines")
 
-            row = [x.strip() for x in line.strip().split(',')]
+            row = [x.strip() for x in line.strip().split(",")]
             if len(row) != board_size:
                 raise BadBoardFormat("the length of each row must be the same")
 
@@ -433,9 +513,12 @@ def read_boggle_file(file):
 
         return board
 
+
 def find_paths_by_word(board_letters, dictionary_path, max_len):
-    '''Return list of paths by word'''
+    """Return list of paths by word"""
     boggle_board = BoggleBoard(board_letters, max_len)
     boggle_tree = build_full_boggle_tree(boggle_board, dictionary_path)
-    paths_by_word = functools.reduce(operator.iconcat, [x.word_paths for x in boggle_tree.values()], [])
+    paths_by_word = functools.reduce(
+        operator.iconcat, [x.word_paths for x in boggle_tree.values()], []
+    )
     return paths_by_word
diff --git a/boggler/c/board.h b/boggler/c/board.h
index 9d61f68..2560583 100644
--- a/boggler/c/board.h
+++ b/boggler/c/board.h
@@ -108,7 +108,7 @@ void free_board(Board *b) {
     }
 }
 //Vec2[] get_adjacent_indexes(uint8_t board_size, Vec2 pos) {
-//    // Calculate total possible number of adjacent cells 
+//    // Calculate total possible number of adjacent cells
 //    uint16_t = total_adj_cell_cnt = ((board-size-2) * (board-size-2) * 8) + ((board-size-2) * 4 * 5) + (4 * 3);
 //
 //    Vec2[] indexes = malloc(8 * sizeof(Vec2));
diff --git a/boggler/split_wordlist_en.sh b/boggler/split_wordlist_en.sh
index 692ae43..e04cb9f 100755
--- a/boggler/split_wordlist_en.sh
+++ b/boggler/split_wordlist_en.sh
@@ -4,7 +4,7 @@ if [ -z $1 ] || [ -z $2 ]; then
     echo "Usage: WORDLIST OUT_DIR"
     exit 0
 else
-    rg "(^a[a-z]+).*$" -or '$1' $1 | sort | uniq > "$2/words_a.txt" 
+    rg "(^a[a-z]+).*$" -or '$1' $1 | sort | uniq > "$2/words_a.txt"
     rg "(^b[a-z]+).*$" -or '$1' $1 | sort | uniq > "$2/words_b.txt"
     rg "(^c[a-z]+).*$" -or '$1' $1 | sort | uniq > "$2/words_c.txt"
     rg "(^d[a-z]+).*$" -or '$1' $1 | sort | uniq > "$2/words_d.txt"
diff --git a/boggler/wordlists/dwyl/words_alpha.txt b/boggler/wordlists/dwyl/words_alpha.txt
index ba4e63e..1e42fcf 100644
--- a/boggler/wordlists/dwyl/words_alpha.txt
+++ b/boggler/wordlists/dwyl/words_alpha.txt
@@ -370100,4 +370100,4 @@ zwinglianism
 zwinglianist
 zwitter
 zwitterion
-zwitterionic
\ No newline at end of file
+zwitterionic
diff --git a/tests/test_read_boards.py b/tests/test_read_boards.py
index a2d65a2..b0ac4cc 100644
--- a/tests/test_read_boards.py
+++ b/tests/test_read_boards.py
@@ -4,19 +4,22 @@ from boggler.boggler_utils import read_boggle_file, BadBoardFormat
 
 boards_path = Path(Path(__file__).parent.resolve())
 
+
 @pytest.fixture(name="expected_board_4x4")
 def fixture_expected_board_4x4():
     return [
-        ['u', 'n', 'r', 'e'],
-        ['qu', 'n', 'i', 'l'],
-        ['i', 's', 'h', 'a'],
-        ['s', 'e', 'l', 'b']
+        ["u", "n", "r", "e"],
+        ["qu", "n", "i", "l"],
+        ["i", "s", "h", "a"],
+        ["s", "e", "l", "b"],
     ]
 
+
 @pytest.fixture(name="clean_4x4_path")
 def fixture_clean_4x4_path():
     return Path(boards_path, "./boards/4x4_clean.board")
 
+
 def test_clean_4x4_board(expected_board_4x4, clean_4x4_path):
     """Test 4x4 board with clean input"""
     assert expected_board_4x4 == read_boggle_file(clean_4x4_path)
@@ -27,6 +30,7 @@ def test_clean_4x4_board(expected_board_4x4, clean_4x4_path):
 def fixture_leading_whitespace_4x4_path():
     return Path(boards_path, "./boards/4x4_leading_whitespace.board")
 
+
 def test_leading_whitespace_4x4_board(expected_board_4x4, leading_whitespace_4x4_path):
     """Test 4x4 board with leading whitepace in rows"""
     assert expected_board_4x4 == read_boggle_file(leading_whitespace_4x4_path)
@@ -37,6 +41,7 @@ def test_leading_whitespace_4x4_board(expected_board_4x4, leading_whitespace_4x4
 def fixture_between_whitespace_4x4_path():
     return Path(boards_path, "./boards/4x4_between_whitespace.board")
 
+
 def test_between_whitespace_4x4_board(expected_board_4x4, between_whitespace_4x4_path):
     """Test 4x4 board with whitespace surrounding letters in block"""
     assert expected_board_4x4 == read_boggle_file(between_whitespace_4x4_path)
@@ -47,7 +52,10 @@ def test_between_whitespace_4x4_board(expected_board_4x4, between_whitespace_4x4
 def fixture_trailing_whitespace_4x4_path():
     return Path(boards_path, "./boards/4x4_trailing_whitespace.board")
 
-def test_trailing_whitespace_4x4_board(expected_board_4x4, trailing_whitespace_4x4_path):
+
+def test_trailing_whitespace_4x4_board(
+    expected_board_4x4, trailing_whitespace_4x4_path
+):
     """Test 4x4 board with trailing whitespace in rows"""
     assert expected_board_4x4 == read_boggle_file(trailing_whitespace_4x4_path)
 
@@ -57,6 +65,7 @@ def test_trailing_whitespace_4x4_board(expected_board_4x4, trailing_whitespace_4
 def fixture_blank_lines_4x4_path():
     return Path(boards_path, "./boards/4x4_blank_lines.board")
 
+
 def test_blank_lines_4x4_board(blank_lines_4x4_path):
     """Test 4x4 board with blank lines in board file"""
     with pytest.raises(BadBoardFormat, match="must contain no blank lines"):
@@ -68,6 +77,7 @@ def test_blank_lines_4x4_board(blank_lines_4x4_path):
 def fixture_inconsistent_width_4x4_path():
     return Path(boards_path, "./boards/4x4_inconsistent_width.board")
 
+
 def test_inconsistent_width_4x4_board(inconsistent_width_4x4_path):
     """Test board with irregular number of blocks per row"""
     with pytest.raises(BadBoardFormat, match="length of each row must be the same"):
diff --git a/tests/test_solve_4x4_board.py b/tests/test_solve_4x4_board.py
index 5a0af6f..76a93a0 100755
--- a/tests/test_solve_4x4_board.py
+++ b/tests/test_solve_4x4_board.py
@@ -5,15 +5,17 @@ from boggler.boggler_utils import BoggleBoard, build_full_boggle_tree
 
 WORDLISTS_DIR = Path("./boggler/wordlists/dwyl/").absolute()
 
+
 @pytest.fixture
 def board_4x4():
     return [
-        ['u','n','r','e'],
-        ['qu','n','i','l'],
-        ['i','s','h','a'],
-        ['s','e','l','b']
+        ["u", "n", "r", "e"],
+        ["qu", "n", "i", "l"],
+        ["i", "s", "h", "a"],
+        ["s", "e", "l", "b"],
     ]
 
+
 @pytest.fixture
 def expected_words_max_4():
     return [
@@ -345,15 +347,65 @@ def expected_words_max_4():
         ("blah", [(3, 3), (3, 2), (2, 3), (2, 2)]),
     ]
 
+
 @pytest.fixture
 def expected_words_max_20():
     return [
         ("u", [(0, 0)]),
         ("un", [(0, 0), (1, 1)]),
         ("unn", [(0, 0), (1, 1), (0, 1)]),
-        ("unrelinquishable", [(0, 0), (1, 1), (0, 2), (0, 3), (1, 3), (1, 2), (0, 1), (1, 0), (2, 0), (2, 1), (2, 2), (2, 3), (3, 3), (3, 2), (3, 1)]),
-        ("unrelishable", [(0, 0), (1, 1), (0, 2), (0, 3), (1, 3), (1, 2), (2, 1), (2, 2), (2, 3), (3, 3), (3, 2), (3, 1)]),
-        ("unreliable", [(0, 0), (1, 1), (0, 2), (0, 3), (1, 3), (1, 2), (2, 3), (3, 3), (3, 2), (3, 1)]),
+        (
+            "unrelinquishable",
+            [
+                (0, 0),
+                (1, 1),
+                (0, 2),
+                (0, 3),
+                (1, 3),
+                (1, 2),
+                (0, 1),
+                (1, 0),
+                (2, 0),
+                (2, 1),
+                (2, 2),
+                (2, 3),
+                (3, 3),
+                (3, 2),
+                (3, 1),
+            ],
+        ),
+        (
+            "unrelishable",
+            [
+                (0, 0),
+                (1, 1),
+                (0, 2),
+                (0, 3),
+                (1, 3),
+                (1, 2),
+                (2, 1),
+                (2, 2),
+                (2, 3),
+                (3, 3),
+                (3, 2),
+                (3, 1),
+            ],
+        ),
+        (
+            "unreliable",
+            [
+                (0, 0),
+                (1, 1),
+                (0, 2),
+                (0, 3),
+                (1, 3),
+                (1, 2),
+                (2, 3),
+                (3, 3),
+                (3, 2),
+                (3, 1),
+            ],
+        ),
         ("unrein", [(0, 0), (1, 1), (0, 2), (0, 3), (1, 2), (0, 1)]),
         ("uns", [(0, 0), (1, 1), (2, 1)]),
         ("unsin", [(0, 0), (1, 1), (2, 1), (1, 2), (0, 1)]),
@@ -371,9 +423,58 @@ def expected_words_max_20():
         ("unn", [(0, 0), (0, 1), (1, 1)]),
         ("uni", [(0, 0), (0, 1), (1, 2)]),
         ("unie", [(0, 0), (0, 1), (1, 2), (0, 3)]),
-        ("unrelishable", [(0, 0), (0, 1), (0, 2), (0, 3), (1, 3), (1, 2), (2, 1), (2, 2), (2, 3), (3, 3), (3, 2), (3, 1)]),
-        ("unreliable", [(0, 0), (0, 1), (0, 2), (0, 3), (1, 3), (1, 2), (2, 3), (3, 3), (3, 2), (3, 1)]),
-        ("unrelinquishable", [(0, 0), (0, 1), (0, 2), (0, 3), (1, 3), (1, 2), (1, 1), (1, 0), (2, 0), (2, 1), (2, 2), (2, 3), (3, 3), (3, 2), (3, 1)]),
+        (
+            "unrelishable",
+            [
+                (0, 0),
+                (0, 1),
+                (0, 2),
+                (0, 3),
+                (1, 3),
+                (1, 2),
+                (2, 1),
+                (2, 2),
+                (2, 3),
+                (3, 3),
+                (3, 2),
+                (3, 1),
+            ],
+        ),
+        (
+            "unreliable",
+            [
+                (0, 0),
+                (0, 1),
+                (0, 2),
+                (0, 3),
+                (1, 3),
+                (1, 2),
+                (2, 3),
+                (3, 3),
+                (3, 2),
+                (3, 1),
+            ],
+        ),
+        (
+            "unrelinquishable",
+            [
+                (0, 0),
+                (0, 1),
+                (0, 2),
+                (0, 3),
+                (1, 3),
+                (1, 2),
+                (1, 1),
+                (1, 0),
+                (2, 0),
+                (2, 1),
+                (2, 2),
+                (2, 3),
+                (3, 3),
+                (3, 2),
+                (3, 1),
+            ],
+        ),
         ("unrein", [(0, 0), (0, 1), (0, 2), (0, 3), (1, 2), (1, 1)]),
         ("n", [(0, 1)]),
         ("ni", [(0, 1), (1, 2)]),
@@ -414,14 +515,64 @@ def expected_words_max_20():
         ("re", [(0, 2), (0, 3)]),
         ("rel", [(0, 2), (0, 3), (1, 3)]),
         ("relais", [(0, 2), (0, 3), (1, 3), (2, 3), (1, 2), (2, 1)]),
-        ("relinquish", [(0, 2), (0, 3), (1, 3), (1, 2), (0, 1), (1, 0), (2, 0), (2, 1), (2, 2)]),
-        ("relinquishes", [(0, 2), (0, 3), (1, 3), (1, 2), (0, 1), (1, 0), (2, 0), (2, 1), (2, 2), (3, 1), (3, 0)]),
+        (
+            "relinquish",
+            [(0, 2), (0, 3), (1, 3), (1, 2), (0, 1), (1, 0), (2, 0), (2, 1), (2, 2)],
+        ),
+        (
+            "relinquishes",
+            [
+                (0, 2),
+                (0, 3),
+                (1, 3),
+                (1, 2),
+                (0, 1),
+                (1, 0),
+                (2, 0),
+                (2, 1),
+                (2, 2),
+                (3, 1),
+                (3, 0),
+            ],
+        ),
         ("relish", [(0, 2), (0, 3), (1, 3), (1, 2), (2, 1), (2, 2)]),
         ("relishes", [(0, 2), (0, 3), (1, 3), (1, 2), (2, 1), (2, 2), (3, 1), (3, 0)]),
-        ("relishable", [(0, 2), (0, 3), (1, 3), (1, 2), (2, 1), (2, 2), (2, 3), (3, 3), (3, 2), (3, 1)]),
+        (
+            "relishable",
+            [
+                (0, 2),
+                (0, 3),
+                (1, 3),
+                (1, 2),
+                (2, 1),
+                (2, 2),
+                (2, 3),
+                (3, 3),
+                (3, 2),
+                (3, 1),
+            ],
+        ),
         ("reliable", [(0, 2), (0, 3), (1, 3), (1, 2), (2, 3), (3, 3), (3, 2), (3, 1)]),
-        ("relinquish", [(0, 2), (0, 3), (1, 3), (1, 2), (1, 1), (1, 0), (2, 0), (2, 1), (2, 2)]),
-        ("relinquishes", [(0, 2), (0, 3), (1, 3), (1, 2), (1, 1), (1, 0), (2, 0), (2, 1), (2, 2), (3, 1), (3, 0)]),
+        (
+            "relinquish",
+            [(0, 2), (0, 3), (1, 3), (1, 2), (1, 1), (1, 0), (2, 0), (2, 1), (2, 2)],
+        ),
+        (
+            "relinquishes",
+            [
+                (0, 2),
+                (0, 3),
+                (1, 3),
+                (1, 2),
+                (1, 1),
+                (1, 0),
+                (2, 0),
+                (2, 1),
+                (2, 2),
+                (3, 1),
+                (3, 0),
+            ],
+        ),
         ("rei", [(0, 2), (0, 3), (1, 2)]),
         ("rein", [(0, 2), (0, 3), (1, 2), (0, 1)]),
         ("reis", [(0, 2), (0, 3), (1, 2), (2, 1)]),
@@ -839,6 +990,7 @@ def expected_words_max_20():
         ("bless", [(3, 3), (3, 2), (3, 1), (3, 0), (2, 1)]),
     ]
 
+
 # -----------------------------------------------------
 # Solved board max 4-letter words
 # -----------------------------------------------------
@@ -848,25 +1000,33 @@ def expected_words_max_20():
 def board_4(board_4x4):
     return BoggleBoard(board_4x4, 4)
 
+
 @pytest.fixture
 def tree_4(board_4):
     return build_full_boggle_tree(board_4, Path(WORDLISTS_DIR))
 
+
 @pytest.fixture
 def found_words_4(tree_4):
     return list(chain.from_iterable([x.word_paths for x in tree_4.values()]))
 
+
 # Tests for solved board with max of 4-letter words
 def test_word_count_4_board_4x4_max(expected_words_max_4, tree_4):
-    assert len(expected_words_max_4) == sum(map(lambda x: len(x.word_paths), tree_4.values()))
+    assert len(expected_words_max_4) == sum(
+        map(lambda x: len(x.word_paths), tree_4.values())
+    )
+
 
 def test_words_full_4_board_4x4_max(expected_words_max_4, found_words_4):
     """Verify words and paths match in exact order"""
     assert found_words_4 == expected_words_max_4
 
+
 def test_format_words_4_to_csv():
     pass
 
+
 def test_format_words_4_to_json():
     pass
 
@@ -880,23 +1040,31 @@ def test_format_words_4_to_json():
 def board_20(board_4x4):
     return BoggleBoard(board_4x4, 20)
 
+
 @pytest.fixture
 def tree_20(board_20):
     return build_full_boggle_tree(board_20, WORDLISTS_DIR)
 
+
 @pytest.fixture
 def found_words_20(tree_20):
     return list(chain.from_iterable([x.word_paths for x in tree_20.values()]))
 
+
 # Tests for solved board with max of 20-letter words
 def test_word_count_20_board_4x4_max(expected_words_max_20, tree_20):
-    assert len(expected_words_max_20) == sum(map(lambda x: len(x.word_paths), tree_20.values()))
+    assert len(expected_words_max_20) == sum(
+        map(lambda x: len(x.word_paths), tree_20.values())
+    )
+
 
 def test_words_full_20_board_4x4_max(expected_words_max_20, found_words_20):
     assert found_words_20 == expected_words_max_20
 
+
 def test_format_words_20_to_csv():
     pass
 
+
 def test_format_words_20_to_json():
     pass