def split_code_book(initial, k, e):
    last_code_book = initial
    for i in range(k-1):
        if i == 0:
            new_code_book = np.vstack((last_code_book - e, last_code_book + e))
            new_code_book = np.vsplit(new_code_book, i + 2)
            temp_code_book = last_code_book
            last_code_book = new_code_book
        else:
            if i == 1:
                new_code_book = np.vstack((last_code_book[0] - e, temp_code_book, last_code_book[-1] + e))
            else:
                new_code_book = np.vstack((last_code_book[0] - e, ??? , last_code_book[-1] + e))
            new_code_book = np.vsplit(new_code_book, i + 2)
            temp_code_book = last_code_book
            last_code_book = new_code_book
    return(new_code_book)