In other words, while the substantially non dissolvable region or layer may be somewhat soluble in water, the dissolvable region or layer will have {HEAD ~ a substantially greater solubility} in {TAIL ~ water} so as to dissolve, leaving the non dissolvable region or layer substantially intact at the end of the useful life of the shaped composition 
In other words , while the substantially non dissolvable region or layer may be somewhat soluble in water , the dissolvable region or layer will have { HEAD ~ a substantially greater solubility } in { TAIL ~ water } so as to dissolve , leaving the non dissolvable region or layer substantially intact at the end of the useful life of the shaped composition
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH