What is the ruling if one spouse had a valid excuse for not fasting, and the other spouse did not have an excuse, and intercourse occurs?

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Each spouse is governed by the ruling pertaining to their individual state. If both spouses were excused, their ruling is as described previously, regardless of whether their excuses ceased simultaneously (e.g., both arriving from travel) or sequentially (e.g., the husband arriving from travel and the wife completing her menstruation).