{HEAD ~ The conditions} of such mixing are not critical, provided that {TAIL ~ good wetting} of the polymer occurs 
{ HEAD ~ The conditions } of such mixing are not critical , provided that { TAIL ~ good wetting } of the polymer occurs
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH