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For the case that $k=1$ (i.e., for the case of interactive proofs), Goldreich, Vadhan and Wigderson ({\\em Computational Complexity'02}) demonstrate that $\\SZK$ exactly characterizes languages having 1-bit proof systems with\"non-trivial\" soundness (i.e., $1/2 < s \\leq 1-2\\epsilon$). 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