A system 10 wherein said second support defines a slot of {HEAD ~ predetermined dimensions} therein for removably receiving {TAIL ~ said second hinge side} within said slot 
A system 10 wherein said second support defines a slot of { HEAD ~ predetermined dimensions } therein for removably receiving { TAIL ~ said second hinge side } within said slot
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH