Subsequently, we eliminate the unstable materials among the plus one valence candidates by cross-referencing the formulae against their "energy above convex hull" parameter in the Materials Project. If the energy is greater than zero eV, the candidates are discarded, leaving 1,085 candidates remaining. Then, we also removed any compounds that contain radioactive elements (Np, U, Pa, Th, Pm, Ac) to arrive at a final number of 1,079 materials, which were subject to ab initio analysis.