#racing_boat  a boat propelled by oarsmen and designed for racing
  supertype:  small_boat__smallboat  a boat that is small
  subtype:  racing_gig  a light narrow racing boat for two or more oarsmen
  subtype:  racing_shell__shell  a very light narrow racing boat
     subtype:  racing_skiff__single_shell  a shell for a single oarsman
     subtype:  scull  a racing shell propelled by one or two oarsmen pulling two oars

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