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