The upper portion and the lower portion of the first side and the second side have a plurality of pegs and {HEAD ~ holes} to facilitate {TAIL ~ the coupling} of the first side to the second side 
to facilitate
The upper portion and the lower portion of the first side and the second side have a plurality of pegs and { HEAD ~ holes } to facilitate { TAIL ~ the coupling } of the first side to the second side
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH