If the vector length is smaller than the threshold map value, the block 1250 is entered, this block representing {HEAD ~ the substituting} of {TAIL ~ a 0 bit} for the vector 
of
If the vector length is smaller than the threshold map value , the block 1250 is entered , this block representing { HEAD ~ the substituting } of { TAIL ~ a 0 bit } for the vector
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 HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH