In the illustrated embodiment, the least significant bit of each submask corresponds to {TAIL ~ port} of exit 634, and the most significant bit corresponds to port of {HEAD ~ exit} 646 
In the illustrated embodiment , the least significant bit of each submask corresponds to { TAIL ~ port } of exit 634 , and the most significant bit corresponds to port of { HEAD ~ exit } 646
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH