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Provide a General Refine Evalulation Language (GREL) such that: If it contains the text discount or offer or sale, then set the value in has_offer

Provide a General Refine Evalulation Language (GREL) such that: If it contains the text discount or offer or sale, then set the value in has_offer as 1, else 0. Provide the GREL expression used to perform this. Please include all types of word casing (e.g. Sale, sale, SALE all the same).

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