The assembly comprises {HEAD ~ a plurality} of first slotted partitions intersecting with {TAIL ~ a plurality} of second slotted partitions to form a collapsible matrix 
The assembly comprises { HEAD ~ a plurality } of first slotted partitions intersecting with { TAIL ~ a plurality } of second slotted partitions to form a collapsible matrix
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH