wherein said means causes said output to swing over substantially {HEAD ~ the entire range} of {TAIL ~ power supply voltage}; and 
wherein said means causes said output to swing over substantially { HEAD ~ the entire range } of { TAIL ~ power supply voltage } ; and
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH