#metrical_foot__foot__metrical_unit  a group of 2 or 3 syllables forming the basic unit of poetic rhythm
  supertype:  cadence__meter__measure__beat  (prosody) the accent in a metrical foot of verse
  subtype:  dactyl  a metrical unit with stressed-unstressed-unstressed syllables
  subtype:  iamb__iambus  a metrical unit with unstressed-stressed syllables
  subtype:  anapest__anapaest  a metrical unit with unstressed-unstressed-stressed syllables
  subtype:  amphibrach  a metrical unit with unstressed-stressed-unstressed syllables (e.g., `remember')
  subtype:  trochee  a metrical unit with stressed-stressed-unstressed syllables
  subtype:  spondee  a metrical unit with stressed-stressed syllables
  subtype:  dibrach__pyrrhic  a metrical unit with unstressed-unstressed syllables

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