Does eating a mixed fruit (partially ripe, partially unripe) fulfill an oath to eat either a single ripe date or a single unripe date?

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If a person swears to eat either one ripe date (rutbah) or one unripe date (basrah), or swears not to eat either, and consumes a mixed date (munṣaf), neither fulfillment nor breaking of the oath occurs because the mixed fruit does not constitute a single, distinct ripe date or a single, distinct unripe date.