#couplet  a stanza consisting of two successive lines of verse; usually rhymed
  supertype:  #stanza  a fixed number of lines of verse forming a unit of a poem
  part:  #line_of_poetry
  subtype:  #closed_couplet  a rhymed couplet that forms a complete syntactic unit
  subtype:  #heroic_couplet  a couplet written in an elevated style

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