Conveniently, each zone may be the width of one board across the bowling alley so that {HEAD ~ different discrete amounts} of oil can be applied to {TAIL ~ each board} 
Conveniently , each zone may be the width of one board across the bowling alley so that { HEAD ~ different discrete amounts } of oil can be applied to { TAIL ~ each board }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL