{HEAD ~ A variety} of materials can be used for such enteric layers or {TAIL ~ coatings}, such materials including a number of polymeric acids and mixtures of polymeric acids with such materials as shellac, cetyl alcohol, and cellulose acetate 
used for
{ HEAD ~ A variety } of materials can be used for such enteric layers or { TAIL ~ coatings } , such materials including a number of polymeric acids and mixtures of polymeric acids with such materials as shellac , cetyl alcohol , and cellulose acetate
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