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