The remaining components of matrix N are either 0, 1, or are the negative of one of the values {HEAD ~ A} to Z or {TAIL ~ AA} to AE 
The remaining components of matrix N are either 0 , 1 , or are the negative of one of the values { HEAD ~ A } to Z or { TAIL ~ AA } to AE
OTH 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 OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH