pycon2013 /

#!/usr/bin/env python

import re
from collections import Counter
from itertools import combinations

def tokenize(text):
    return set(
        for w in re.findall('[a-z]+', text, re.I)
        if len(w) >= 4)

def histogram(w1, w2):
    return Counter(w1 + w2)

def is_anagram(w1, w2, w3, w4):
    return histogram(w1, w2) == histogram(w3, w4)

def find_2anagrams(words):
    for w1, w2 in combinations(words, 2):
        for w3, w4 in combinations(words - {w1, w2}, 2):
            if is_anagram(w1, w2, w3, w4):
                yield w1, w2, w3, w4

def process(fo):
    text =
    words = tokenize(text)
    seen = set()
    for w1, w2, w3, w4 in find_2anagrams(words):
        wset = {w1, w2, w3, w4}
        if seen & wset:
        print('{} {}, {} {}'.format(w1, w2, w3, w4))
        seen |= wset

if __name__ == '__main__':
    from sys import stdin
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