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