In the illustrated embodiment, each submask in table 706 has {TAIL ~ seven bits} corresponding, respectively, to the seven ports of {HEAD ~ exit} 634 646 
In the illustrated embodiment , each submask in table 706 has { TAIL ~ seven bits } corresponding , respectively , to the seven ports of { HEAD ~ exit } 634 646
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH