{HEAD ~ A pad} is placed on {TAIL ~ the turntable}, where the turntable rotates in a first direction 
{ HEAD ~ A pad } is placed on { TAIL ~ the turntable } , where the turntable rotates in a first direction
HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH