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