What is the ruling when a husband says, 'You are divorced three times except one divorce, except one divorce'?

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One interpretation suggests the second exception is nullified, and the first is valid, resulting in two divorces. Another interpretation suggests three divorces occur because the second exception implies affirmation of one divorce (as an exception from negation is an affirmation), and this affirmation is accepted concerning the imposition of divorce, even if it is not accepted regarding its negation, similar to the case where saying 'You are divorced two and a half times' results in three divorces.