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We present a measurement of the Cabibbo-Kobayashi-Maskawa unitarity triangleangle $ \phi_{3} $ (also known as~$\gamma$) using a model-independent Dalitzplot analysis of \linebreak $B^+\to D\left(K_{S}^{0}h^{+}h^{-}\right)h^+$,where $D$ is either a $D^0$ or $\bar{D}{}^0$ meson and $h$ is either a $\pi$ or$K$. This is the first measurement that simultaneously uses Belle and Belle~IIdata, combining samples corresponding to integrated luminosities of\SI{711}{fb^{-1}} and \SI{128}{fb^{-1}}, respectively. All data wereaccumulated from energy-asymmetric $e^+e^-$ collisions at a centre-of-massenergy corresponding to the mass of the $\Upsilon(4S)$ resonance. We measure$\phi_3 = \left(78.4 \pm 11.4 \pm 0.5 \pm 1.0 \right)^{\circ}$, where the firstuncertainty is statistical, the second is the experimental systematicuncertainty and the third is from the uncertainties on external measurements ofthe $D$-decay strong-phase parameters.

Combined analysis of Belle and Belle II data to determine the CKM angle $ \phi_{3} $ using $B^+ \to D(K_{S}^0 h^- h^+) h^+$ decays