The discharge energy applied to the medium causes an expansion of {TAIL ~ the medium}, which in turn causes {HEAD ~ an expansion} of the sealed container 
The discharge energy applied to the medium causes an expansion of { TAIL ~ the medium } , which in turn causes { HEAD ~ an expansion } of the sealed container
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH