{TAIL ~ The concentration} of {HEAD ~ the para aminoacetanilide} is determined by a color test in which the para aminoacetanilide was reacted with phenol 
{ TAIL ~ The concentration } of { HEAD ~ the para aminoacetanilide } is determined by a color test in which the para aminoacetanilide was reacted with phenol
TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH