With RASs, the active space is partitioned into three subspaces: RAS1, RAS2, and RAS3. The RAS2 space is treated as the CAS space, and full configuration interaction is performed. The numbers of holes and electrons, respectively, in RAS1 and RAS3 are limited by setting maximum values. The nomenclature for RAS is the same as in the previous study: (ie,jo)/(ke,lo)/m, where i and j are the numbers of electrons and orbitals in the entire active space (RAS1+RAS2+RAS3), respectively; k and l are those in the RAS2 space, respectively; and m is the maximum number of electrons excited from RAS1 or into RAS3.