The blister sheet is in the form of {HEAD ~ a strip} with {TAIL ~ the blisters} aligned 
The blister sheet is in the form of { HEAD ~ a strip } with { TAIL ~ the blisters } aligned
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH