In one embodiment, the non dissolvable region or {HEAD ~ layer} may be free of {TAIL ~ fatty acid} or fatty acid salt materials  
free of
In one embodiment , the non dissolvable region or { HEAD ~ layer } may be free of { TAIL ~ fatty acid } or fatty acid salt materials
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH