Using a laser, a first series of laser drilled wells, having a first spacing, are made in {HEAD ~ the substrate material} to define {TAIL ~ a substantial portion} of the perimeter of the irregular shaped substrate 
to define
Using a laser , a first series of laser drilled wells , having a first spacing , are made in { HEAD ~ the substrate material } to define { TAIL ~ a substantial portion } of the perimeter of the irregular shaped substrate
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH