{HEAD ~ The polymers} have {TAIL ~ a controlled degree} of hydrophobicity with a corresponding controlled degree of erosion in an aqueous or a biological environment of use 
have
{ HEAD ~ The polymers } have { TAIL ~ a controlled degree } of hydrophobicity with a corresponding controlled degree of erosion in an aqueous or a biological environment of use
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH