What is the ruling if a husband says to his wife, 'If you have one period, you are divorced, and if you have two periods, you are divorced'?

Primary text

If the husband states, 'If you have one period, you are divorced,' and she has one period, one divorce occurs. When she has a second period, the second divorce occurs upon her purification from that second period. This case is interpreted sequentially based on the pronouncement.