The etching selectivity can prevent {HEAD ~ over etching} from harmfully affecting {TAIL ~ the leads} 17, which leads to fabrication of satisfactory products 
from harmfully affecting
The etching selectivity can prevent { HEAD ~ over etching } from harmfully affecting { TAIL ~ the leads } 17 , which leads to fabrication of satisfactory products
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH