{HEAD ~ The main path} amplifies a power level of {TAIL ~ an input signal} to generate a path turning signal 
{ HEAD ~ The main path } amplifies a power level of { TAIL ~ an input signal } to generate a path turning signal
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH