Quoting%20commentary for Makkot 10:12

עד שלא יאמר יש לי בדין אם ענש על בת אביו שלא בת אמו ובת אמו שלא בת אביו בת אביו ובת אמו לא כל שכן הא למדת שאין עונשין מן הדין

Without these words, I would still be able to derive it [punishment for a full sister] with a fortiori, If one gets punished for the daughter of his father who isn't the daughter of his mother [half-sister from the father] and the daughter of his mother who isn't the daughter of his father [half-sister from the mother], shouldn't he certainly [be punished] for the daughter of his father and the daughter of his mother [his full sister]? Thus we see that one cannot derive a punishment from a fortiori.

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