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This estimate is sharp if one considers all multipliers of the form $\\sum_i \\sigma_{i} R_{i} R^{\\ast}_{i}$ with $| \\sigma_{i} | \\leqslant 1$ and infinite groups. In the real valued case, we obtain better sharp estimates for some specific multipliers, such as $\\sum_{i} \\sigma_{i} R_{i} R^{\\ast}_{i}$ with $0 \\leqslant \\sigma_{i} \\leqslant 1$. 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