If a defective PCB is found after {HEAD ~ the manufacture} of {TAIL ~ continuously arranged circuit patterns}, then the defective PCB sheet portion is removed to replace it with a new PCB sheet portion 
of
If a defective PCB is found after { HEAD ~ the manufacture } of { TAIL ~ continuously arranged circuit patterns } , then the defective PCB sheet portion is removed to replace it with a new PCB sheet portion
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH