Reference for Ketubot 202:21

תנן הנושא את האשה ופסקה עמו לזון את בתה חמש שנים חייב לזונה חמש שנים מאי לאו כי האי גוונא

We learned: If a man married a woman and she made an agreement with him that he will maintain her daughter for five years, he must maintain her for five years. Does this not refer to a case like this?

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