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