The substrate 1 is formed with a relatively large hole and {HEAD ~ a plurality} of {TAIL ~ smaller holes} surrounding the large hole 
of
The substrate 1 is formed with a relatively large hole and { HEAD ~ a plurality } of { TAIL ~ smaller holes } surrounding the large hole
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH