Alternatively, membrane 28 may be provided in {TAIL ~ the form} of {HEAD ~ individual sheets}, rather than in roll form 
Alternatively , membrane 28 may be provided in { TAIL ~ the form } of { HEAD ~ individual sheets } , rather than in roll form
OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH