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