{HEAD ~ Lateral ends} of each wrapping portion are formed into {TAIL ~ a Z shape} to produce the Z lock system 
are formed into
{ HEAD ~ Lateral ends } of each wrapping portion are formed into { TAIL ~ a Z shape } to produce the Z lock system
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH