#function_word__closed-class_word  a word that serves a grammatical function but has no identifiable meaning
  supertype:  word  a unit of language that native speakers can identify; "words are the blocks from which sentences are made"; "he hardly said ten words all morning"
  subtype:  determiner  preposition  pronoun  conjunctive  particle.function_word
  part:  grammatical_meaning__grammaticalmeaning  the meaning of a word that depends on its role in a sentence; varies with inflectional form

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