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