#quatrain  a stanza of four lines
  supertype:  stanza  a fixed number of lines of verse forming a unit of a poem
  subtype:  elegiac_stanza__elegiacstanza  a quatrain in iambic pentameter with abab rhyme scheme
  subtype:  heroic_stanza  a quatrain written in elevated style; the rhyme scheme is abab

No statement uses or specializes quatrain; click here to add one.