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We discuss possibilities to test physics beyond the Standard Model in$\vert\Delta c\vert=\vert\Delta u\vert= 1$ semileptonic, hadronic and missingenergy decay modes. Clean null test observables such as angular observables,CP-asymmetries and lepton universality tests are presented andmodel-independent correlations as well as details within flavorful,anomaly-free $Z^\prime$ models are worked out.

Physics reach of ${D}_{(s)}\to \pi(K) \ell\ell$ and other charming null test opportunities