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