This allows {HEAD ~ the level shifter} to be designed for {TAIL ~ optimal transitional performance} without the sacrifice of a potentially long propagation delay on the output nodes 
to be designed for
This allows { HEAD ~ the level shifter } to be designed for { TAIL ~ optimal transitional performance } without the sacrifice of a potentially long propagation delay on the output nodes
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH