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