For example, {HEAD ~ the power grid planner} may reduce {TAIL ~ the number} of vias or via arrays in the power grid structure by locating a power via only at every Dth power intersection and a ground via only at every Dth ground intersection, D being an integer greater than 1 
For example , { HEAD ~ the power grid planner } may reduce { TAIL ~ the number } of vias or via arrays in the power grid structure by locating a power via only at every Dth power intersection and a ground via only at every Dth ground intersection , D being an integer greater than 1
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH