Reference for Ketubot 131:4

בעי רב פפא עשתה לו שתים בבת אחת מהו בעי רבינא שלשה או ד' בבת אחת מהו תיקו:

Papa raised the question: What is the law where she performed for him two [kinds of work] simultaneously? Rabina raised the question: What is the ruling where she did three or four [kinds of work] simultaneously? These remain undecided.

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