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sentence1 and sentence2 have different lengths, return false.wordToSimilarWords.[word1, word2] in similarPairs, add word2 to wordToSimilarWords[word1] and word1 to wordToSimilarWords[word2].sentence1 using index i:
sentence1[i] equals sentence2[i], continue to the next word.sentence2[i] is in the set wordToSimilarWords[sentence1[i]], continue to the next word.false.true.