The material is chosen so that {HEAD ~ the dissolution} of the binder occurs at {TAIL ~ the desired rate} 
occurs at
The material is chosen so that { HEAD ~ the dissolution } of the binder occurs at { TAIL ~ the desired rate }
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL