Methods and apparatus for defining Manhattan power grid structures having {HEAD ~ a reduced number} of {TAIL ~ vias} 
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Methods and apparatus for defining Manhattan power grid structures having { HEAD ~ a reduced number } of { TAIL ~ vias }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL