This intermittent signal {TAIL ~ 8 a} is referred to as {HEAD ~ intermittent input signal} 8 a 
This intermittent signal { TAIL ~ 8 a } is referred to as { HEAD ~ intermittent input signal } 8 a
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH