{HEAD ~ The chemical bath} may be used to process semiconductor wafers and circuits, printed circuit boards, optical components and {TAIL ~ similar workpieces} 
used to process
{ HEAD ~ The chemical bath } may be used to process semiconductor wafers and circuits , printed circuit boards , optical components and { TAIL ~ similar workpieces }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL REL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL