What is the ruling if a man with three wives states three conditional divorce statements in sequence involving oaths about each wife?

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If a man has three wives, Zaynab, Umrah, and Hafsah, and he states: 'If you swear by the divorce of Zaynab, then Umrah is divorced.' Then he says: 'If you swear by the divorce of Umrah, then Hafsah is divorced.' Then he says: 'If you swear by the divorce of Hafsah, then Zaynab is divorced.' The ruling is that Umrah is divorced. If he substitutes Zaynab with Umrah in the first statement, then Hafsah is divorced. If he repeats the conditional statement afterward, one divorce falls upon one of them based on the previously established chain.