{TAIL ~ The outer peripheral cell wall} includes {HEAD ~ an outermost peripheral cell wall} forming part of the outer peripheral surface of the block 
{ TAIL ~ The outer peripheral cell wall } includes { HEAD ~ an outermost peripheral cell wall } forming part of the outer peripheral surface of the block
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH