The strength of the acid solution is chosen to rapidly dissolve the oxides or the oxygen containing compounds, and the choice is within {HEAD ~ the skill} of {TAIL ~ a person} skilled in the art 
of
The strength of the acid solution is chosen to rapidly dissolve the oxides or the oxygen containing compounds , and the choice is within { HEAD ~ the skill } of { TAIL ~ a person } skilled in the art
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH 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