Each of {HEAD ~ the first slotted partitions} has {TAIL ~ opposed slots} extending inwardly from opposed edges of the partition to facilitate folding the partition 
Each of { HEAD ~ the first slotted partitions } has { TAIL ~ opposed slots } extending inwardly from opposed edges of the partition to facilitate folding the partition
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH