{HEAD ~ Each second slotted partition} 14 has a first or bottom edge 18, a second or top opposed edge 20 and {TAIL ~ a pair} of side edges 22 
{ HEAD ~ Each second slotted partition } 14 has a first or bottom edge 18 , a second or top opposed edge 20 and { TAIL ~ a pair } of side edges 22
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH