The pair of {HEAD ~ stacks} is connected by a length of material which is folded on {TAIL ~ top} of the stacks 
The pair of { HEAD ~ stacks } is connected by a length of material which is folded on { TAIL ~ top } of the stacks
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH