Reference for Chullin 238:7

רב אושעיא שומר אוכל שחלקו קמיבעיא ליה

Since this [half of the protection does not protect the other [half of the foodstuff] and the other [half of the protection] does not protect this [half of the foodstuff] they cannot be reckoned together, or, it may be, since each [half of the protection] protects its own [half of the foodstuff] they can be reckoned together?

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