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