The method includes {HEAD ~ processes} of {TAIL ~ a power grid planner}, power grid router, power grid verifier, and global signal router that are used iteratively to define and produce a power grid structure 
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The method includes { HEAD ~ processes } of { TAIL ~ a power grid planner } , power grid router , power grid verifier , and global signal router that are used iteratively to define and produce a power grid structure
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL 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