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