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