wherein the A, B, C and D register {HEAD ~ values} at the beginning of the time critical path are {TAIL ~ An}, Bn, Cn, Dn, and further wherein the A, B, C and D register values at the end of the time critical path are An+4, Bn+4, Cn+4, Dn+4 
are
wherein the A , B , C and D register { HEAD ~ values } at the beginning of the time critical path are { TAIL ~ An } , Bn , Cn , Dn , and further wherein the A , B , C and D register values at the end of the time critical path are An+4 , Bn+4 , Cn+4 , Dn+4
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH