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For the determination of the Cabbibo-Kobayashi-Maskawa matrix element$|V_{cb}|$ from inclusive data a precise knowledge of the semileptonic $b \toc$ decay rate is necessary. Since this observable has a bad convergencebehavior when the heavy quark masses are expressed in the on-shell or$\overline{\text{MS}}$ scheme the latest determinations have been obtained inthe so called kinetic mass scheme. The relation between the different schemesneeds to be known to high precision as well. In this proceedings we present ourrecent calculations which push the precision of both ingredients to$\mathcal{O}(\alpha_s^3)$. The results can be used to improve the inclusivedetermination of $|V_{cb}|$.

$\mathcal{O}(\alpha_s^3)$ calculations for the inclusive determination of $|V_{cb}|$