In {HEAD ~ the case} of {TAIL ~ a positive logic signal}, the signal is active high where the logically true state corresponds to a logic level one 
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In { HEAD ~ the case } of { TAIL ~ a positive logic signal } , the signal is active high where the logically true state corresponds to a logic level one
OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH