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399 Let (x_0, ..., x_n = m) be the maximal chain of descent of m within S.401 Then union of U with {x_{k+1}, ..., x_n} is obviously non-revealing.402 * otherwise if all its elements are locked, then none of {x_0, ..., x_n}406 S and union of U and {x_k, ..., x_n} is non-revealing.