means responsive to {TAIL ~ the timing signals} for generating {HEAD ~ a second input signal} having a frequency equal to the timing signal frequency divided by a second factor; and 
means responsive to { TAIL ~ the timing signals } for generating { HEAD ~ a second input signal } having a frequency equal to the timing signal frequency divided by a second factor ; and
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH