Question: At the beginning of Section 12.6, it was noted that given the CBC MAC of a oneblock message (X), say (T=operatorname{MAC}(K, X)), the adversary immediately

At the beginning of Section 12.6, it was noted that given the CBC MAC of a oneblock message $X$, say $T=\operatorname{MAC}(K, X)$, the adversary immediately knows the CBC MAC for the two-block message $X \|(X \oplus T)$ since this is once again $T$. Justify this statement.

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