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Question
Where is it written that a person can’t eat tuna-fish and cheese together .e.g. noodles with cheese and tuna together?
Answer
In fact, the Talmud (Chulin 111b) explicitely allows eating fish with "Kutach", a cheese like dish. Though it is common for Sephardim to refrain from eating fish with cheese, the Ashkenazi custom is to permit it.

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