Is the exception of the entire second number valid when two amounts are joined by 'wa' (and)?

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The exception of the entire second number in cases like saying 'I owe him two dirhams and three dirhams, except two dirhams' is invalid. This ruling holds because the exception effectively negates the entirety of the first stipulated amount, making it analogous to saying, 'Honor Zayd and Amr, except Zayd.'