| http://www.w3.org/ns/prov#value | - In the presence of an active ingredient the chewing gum may preferably also comprise a carrier known in the art. [0118] The chewing gum centres according to the present invention may contain aroma agents and flavouring agents including natural and synthetic flavourings e.g. in the form of natural vegetable components, essential oils, essences, extracts, powders, including acids and other substance
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