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We prove that for every $\\gamma \\geq 1$, \\[\n  \\Omega_{\\eta(\\gamma)}(A)\n  =\\bigcup_{\\kappa(S)\\leq\\gamma}W(S^{-1}AS),\n  \\qquad\n  \\eta(\\gamma)=\\frac{2}{\\gamma+\\gamma^{-1}}, \\] where $\\kappa(S)=\\|S\\|\\,\\|S^{-1}\\|$. 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