{HEAD ~ The five main grooves} include a single first main groove, {TAIL ~ two second main grooves}, and two third main grooves 
include
{ HEAD ~ The five main grooves } include a single first main groove , { TAIL ~ two second main grooves } , and two third main grooves
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH