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The non-observation of WIMP dark matter might be explained by the existence of complex dark sectors. We illustrate, on a model of colored coannihilation, that the Sommerfeld effect and bound state formation are fundamental in calculating the relic density of dark matter accurately.We point out that a flat correction factor accounting for those effects cannot be employed. Furthermore, we find that the parameter previously excluded by experiments still remains viable. Lastly, we demonstrate that bound state searches at the LHC can be crucial in testing such a model.