The composition 1, wherein {HEAD ~ the polymer system} comprises {TAIL ~ hydroxypropylmethylcellulose} and ethylcellulose 
comprises
The composition 1 , wherein { HEAD ~ the polymer system } comprises { TAIL ~ hydroxypropylmethylcellulose } and ethylcellulose
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH