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We inspect the effects on $D^0 \\to \\pi^0 \\nu \\bar{\\nu}$, $D^+ \\to \\pi^+ \\nu \\bar{\\nu}$ and $B_c \\to B^+ \\nu \\bar{\\nu} $ decays which are induced by the quark level transition $c \\to u \\nu \\bar{\\nu}$. 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We inspect the effects on $D^0 \\to \\pi^0 \\nu \\bar{\\nu}$, $D^+ \\to \\pi^+ \\nu \\bar{\\nu}$ and $B_c \\to B^+ \\nu \\bar{\\nu} $ decays which are induced by the quark level transition $c \\to u \\nu \\bar{\\nu}$. 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