The drape comprises {TAIL ~ a pair} of stacks of {HEAD ~ panels} which are folded around parallel fold lines 
The drape comprises { TAIL ~ a pair } of stacks of { HEAD ~ panels } which are folded around parallel fold lines
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH