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Using the $D_s^+ -> \\phi \\mu^+ \\nu_\\mu$ yield measured previously in this experiment, we obtain $B(D_s^+ --> \\mu^+ \\nu_\\mu) / B(D_s^+ --> \\phi \\mu^+ \\nu_\\mu) =0.16 \\pm 0.06 \\pm 0.03$. 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