In {HEAD ~ 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 exit 646 
In { HEAD ~ 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 exit 646
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD 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 OTH OTH