{HEAD ~ The first circuit} uses {TAIL ~ the clock signal} received at the first input node to control the frequency of the oscillator 
uses
{ HEAD ~ The first circuit } uses { TAIL ~ the clock signal } received at the first input node to control the frequency of the oscillator
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 OTH