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