| http://www.w3.org/ns/prov#value | - More specifically, the combustible materials employed in the present invention are selected from the group consisting of starch, and starch and cellulose derivatives including salts thereof containing the recurring anhydroglucose unit ##EQU1## wherein at least one R is selected from the group consisting of lower alkyl, hydroxy lower alkyl, carboxy alkyl groups, and mixtures thereof, and the remain
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