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Misner, is applied to the calculation of $S$-wave hadron-hadron scatterings by the HAL QCD method in lattice QCD. We consider the Nambu-Bethe-Salpeter (NBS) wave function for the spin-singlet $\\Lambda_c N$ system calculated in the $(2+1)$-flavor QCD on a $(32a~\\mathrm{fm})^3$ lattice at the lattice spacing $a\\simeq0.0907$ fm and $m_\\pi \\simeq 700$ MeV. 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