A piston coupled to {HEAD ~ a piston rod} is fitted in a sealed cylinder in which {TAIL ~ oil} is contained 
A piston coupled to { HEAD ~ a piston rod } is fitted in a sealed cylinder in which { TAIL ~ oil } is contained
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH