{TAIL ~ A content} of {HEAD ~ 4.0 percent} by weight is already considered sufficient in every case 
{ TAIL ~ A content } of { HEAD ~ 4.0 percent } by weight is already considered sufficient in every case
TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH