In response to the active signal on terminal R, {HEAD ~ SR flip flop} generates {TAIL ~ an active signal} on output terminal Q and an inactive signal on output terminal Q 
In response to the active signal on terminal R , { HEAD ~ SR flip flop } generates { TAIL ~ an active signal } on output terminal Q and an inactive signal on output terminal Q
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH