{HEAD ~ The devices} additionally contain {TAIL ~ a surfactant erosion rate modifier} that cooperates with and interacts with polymers for regulating the rate of erosion of the polymers 
additionally contain
{ HEAD ~ The devices } additionally contain { TAIL ~ a surfactant erosion rate modifier } that cooperates with and interacts with polymers for regulating the rate of erosion of the polymers
HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH