The bladder expends while applying {HEAD ~ a pressure} on the thermoplastic sheet against the wall from the bottom portion to {TAIL ~ the top portion} 
The bladder expends while applying { HEAD ~ a pressure } on the thermoplastic sheet against the wall from the bottom portion to { TAIL ~ the top portion }
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL