Verses 42-45 deal with the registration of the Merarite clans. These verses are very similar to verses 34-37 (see the comments there).
Quoted with permission from de Regt, Lénart J. and Wendland, Ernst R. A Handbook on Numbers. (UBS Helps for Translators). Miami: UBS, 2016. For this and other handbooks for translators see here .