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Here we discuss the theoretical uncertainty from penguin contributions that can be mitigated through the use of isospin analyses. We show that uncertainty from penguin pollution on a measurement of $\\beta_c$ (or alternatively the mixing phase) in $D^0\\to \\pi^+\\pi^-$ ($\\rho^+\\rho^-$) decays is $2.7^\\circ$ ($4.6^\\circ$). 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