#shift  a group of workers who work for a specific period of time
  supertype:  work_force__workforce__manpower__hands__hand__men  the force of workers available
  subtype:  day_watch__daywatch__day_shift__dayshift  workers who work during the day (as 8 a.m. to 4 p.m.)
  subtype:  evening_shift__eveningshift  workers who work during the evening (as 4 p.m. to midnight)
  subtype:  night_shift__nightshift__graveyard_shift__graveyardshift  workers who work during the night (as midnight to 8 a.m.)

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