"""This module contains code from
Think Python by Allen B. Downey
http://thinkpython.com

Copyright 2012 Allen B. Downey
License: GNU GPLv3 http://www.gnu.org/licenses/gpl.html

"""

from inlist import *


def reverse_pair(word_list, word):
    """Checks whether a reversed word appears in word_list.

    word_list: list of strings
    word: string
    """
    rev_word = word[::-1]
    return in_bisect(word_list, rev_word)
        

if __name__ == '__main__':
    word_list = make_word_list()
    
    for word in word_list:
        if reverse_pair(word_list, word):
            print word, word[::-1]