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To prove soundness, we need to show that for any I ? I(A), I fails T C implies ¬(I tioco A) ,
Traces(I) ? Traces(T C) leading to Fail By the construction of the set E Fail in T C, either ? = ? ? .a.0 where ? ? ? Traces(DP), a ? ? DP ! is unspecified in DP after ? ? , or ? = ? ? .? where ? > 0 is unspecified in DP after ?. In both cases, this means that ¬(I tioco DP), thus T C is sound for DP. Now, as DP is an io-abstraction of AxT P (P DP), by Corollary 1 this implies T C is sound for P. Finally, we have Traces(P) = Traces(A), which trivially implies A P, and then T C is also sound for A ,