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