Device 1, wherein {HEAD ~ the third sub block} includes {TAIL ~ a selective passage gate} of which the input is connected to the output of the second sub block and which is controlled by the output of the first sub block 
Device 1 , wherein { HEAD ~ the third sub block } includes { TAIL ~ a selective passage gate } of which the input is connected to the output of the second sub block and which is controlled by the output of the first sub block
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH