Is it permissible to marry the daughter of the maternal aunt from whom one's sister was nursed?

Your sister, who was suckled by your maternal aunt, is considered a sister to all your maternal aunt's sons and daughters, and to the sons and daughters of your maternal aunt's husband from another wife if your maternal aunt's milk was due to her husband's intercourse. As for you, there is no impediment to your marriage to your maternal aunt's daughter, unless there is a prohibitive suckling between you, and prohibitive suckling is five sucklings.