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Using a data set of 2.92 $fb^{-1}$ of $e^+e^-$ collisions at the $\Psi$(3770)mass accumulated with the BESIII experiment we present preliminary results fromour study of the singly Cabibbo-suppressed decays $D\to\omega\pi$ and the decayof $D^0\to K_S^0K^+K^-$. The decay $D^+\to\omega\pi^+$ is observed for thefirst time with a significance of 5.4$\sigma$ and we find evidence of4.1$\sigma$ for the decay $D^0\to\omega\pi^0$. As a cross-check the branchingfraction $D\to\eta\pi$ is measured and is found to be compatible with thecurrent PDG value. The branching fraction of the decay $D^0\to K_S^0K^+K^-$ ismeasured in an untagged analysis with 11743$\pm$113 signal events and is foundto be (4.622$\pm$0.045(stat.)$\pm$0.181(sys.))$\times 10^{-3}$. This iscompatible with previous measurements but with significant improved precision.

Observation of SCS decay $D^{+,0}\to\omega\pi$ and branching fraction measurement of $D^0\to K_S^0K^+K^-$