#half.period  in various games or performances: either of two periods of play separated by an interval
  supertype:  playing_period__playingperiod__period_of_play__play  (in games or plays or other performances) the time during which play proceeds; "rain stopped play in the 4th inning"
  subtype:  first_half__firsthalf  the first of two halves of play
  subtype:  second_half__last_half  the second of two halves of play

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