import codecs

# http://natura.di.uminho.pt/download/sources/Dictionaries/wordlists/
words = codecs.open("wordlist.txt", "r", "iso8859-1").readlines()
valid = set()

for w in words:
    w = w.strip().lower()
    valid.add(w)
    reversed_word = "".join(reversed(w))
    if reversed_word in valid:
        print(w, "<=>", reversed_word)