{HEAD ~ The selection} and manufacture of such apparatus is within {TAIL ~ the ordinary skill} in the art and can be done using components which are easily constructed or obtained from commercial suppliers 
is within
{ HEAD ~ The selection } and manufacture of such apparatus is within { TAIL ~ the ordinary skill } in the art and can be done using components which are easily constructed or obtained from commercial suppliers
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH REL REL 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