#work_shift__shift__duty_period  the time period during which you are at work
  supertype:  hours  a period of time assigned for work; "they work long hours"
  subtype:  spell  trick.work_shift  watch.work_shift  day_shift  swing_shift  graveyard_shift  split_shift
  part of:  workday__working_day__workingday  the amount of time that a worker must work for an agreed daily wage; "they work an 8-hour day"

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