During this process, {HEAD ~ the remaining portions} of {TAIL ~ the end part} will be pressed out and can be removed 
During this process , { HEAD ~ the remaining portions } of { TAIL ~ the end part } will be pressed out and can be removed
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH