{HEAD ~ Outputs} of {TAIL ~ the first and the second comparator groups 10a} and 10b are supplied to an encoding circuit 11 
of
{ HEAD ~ Outputs } of { TAIL ~ the first and the second comparator groups 10a } and 10b are supplied to an encoding circuit 11
HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH