coupling first and second processors in parallel wherein {TAIL ~ said first and second processors} include {HEAD ~ means} for selectively disabling the outputs thereof 
coupling first and second processors in parallel wherein { TAIL ~ said first and second processors } include { HEAD ~ means } for selectively disabling the outputs thereof
OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH