a second series of laser drilled wells, having a second spacing are made in the substrate material to form {HEAD ~ the remaining portion} of {TAIL ~ the perimeter} of the irregular shaped substrate 
a second series of laser drilled wells , having a second spacing are made in the substrate material to form { HEAD ~ the remaining portion } of { TAIL ~ 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 TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH