The flip flop 38 provides {HEAD ~ an output} that is only dependent on {TAIL ~ the very fast fall times} of the outputs OUT and OUT B 
The flip flop 38 provides { HEAD ~ an output } that is only dependent on { TAIL ~ the very fast fall times } of the outputs OUT and OUT B
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH