The reference edge is covered, preparatory to positioning of {TAIL ~ the table}, by the doubled flap which is folded atop one of {HEAD ~ first pair} of stacks 
The reference edge is covered , preparatory to positioning of { TAIL ~ the table } , by the doubled flap which is folded atop one of { HEAD ~ first pair } of stacks
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH