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