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