What is the ruling if a husband tells four women, 'If you menstruate, you are divorced,' and they reply, 'We have menstruated,' and he confirms their statement?

Primary text

If the husband confirms the menstruation of all four women after they claim to have menstruated under the condition set for their divorce, then all four women are divorced. This is because the condition for their divorce—the menstruation of all four—is established through his confirmation.