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