{HEAD ~ The selection} of {TAIL ~ both amount} and time is easily made by one skilled in the art 
of
{ HEAD ~ The selection } of { TAIL ~ both amount } and time is easily made by one skilled in the art
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH