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: keep is part of castle

Answer: keep PartOf castle


Question: follow can be used with the same meaning of tail

Answer: follow Synonym tail


Question: earth is part of milky_way

Answer:
earth PartOf milky_way