#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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