Each of {TAIL ~ the partitions} has hooks and notches to help hold {HEAD ~ the assembly} together 
Each of { TAIL ~ the partitions } has hooks and notches to help hold { HEAD ~ the assembly } together
OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH