Given a phrase describing the relationship between two words, extract the words and the lexical relationship between them. The relation has to be of the type 'MemberOf', 'MadeOf', 'Synonym', 'Entails', 'HasA', 'HasProperty', 'PartOf', 'Antonym' or 'IsA'. The output should have the format: word1 relation word2.
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Question: clean can be used as the opposite of dirty

Answer: clean Antonym dirty


Question: sleep is a kind of relax

Answer: sleep IsA relax


Question: sheet_of_paper is part of letter

Answer:
sheet_of_paper PartOf letter