[Request] There are ~10⁸⁰ atoms in the observable universe. In this hypothetical situation each atom can be one of the known 118 atoms. So for example 10⁸⁰ hydrogen atoms or 10⁸⁰ - 1 atoms of H and 1 He, 10⁸⁰ - 1 H and 1 lithium etc. How many different possible combinations of atoms could exist?