A portion of the clock tree supplies a plurality of clocks to the execution circuit, {HEAD ~ the plurality} of clocks including at least a first clock clocking the first subcircuit and {TAIL ~ at least a second clock} clocking the second subcircuit 
A portion of the clock tree supplies a plurality of clocks to the execution circuit , { HEAD ~ the plurality } of clocks including at least a first clock clocking the first subcircuit and { TAIL ~ at least a second clock } clocking the second subcircuit
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH