The number of {HEAD ~ bits} in {TAIL ~ each submask} equates to the number of exit ports in fabrics 602 and 604 
in
The number of { HEAD ~ bits } in { TAIL ~ each submask } equates to the number of exit ports in fabrics 602 and 604
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH