We are given a vocabulary V of (lowercase) English words. It uses letters of the English alphabet [a-z], digits [0-9], and the apostrophe symbol [']. No other characters are used in the vocabulary V.

/**An anagram is a word or a phrase made by transposing the letters * of another word or phrase; for example, "parliament" is an anagram * of "partial men," and "software" is an anagram of "swear oft" ...