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