def read_maze(maze_file):
    """ (file open for reading) -> list of list of str

    Return the contents of maze_file in a list of list of str,
    where each character is a separate entry in the list.
    """

    res = []
    for line in maze_file:
        maze_row = [ch for ch in line.strip()]
        res.append(maze_row)

    return res