In particular, P also contains the basic tools to use and develop range-separated density-functional theory (RSDFT, see, e.g., Refs. 143 and 144) which allows to perform multi-con gurational density-functional theory (DFT) calculations within a rigorous mathematical framework. In the core modules of P , singledeterminant approximations of RSDFT are available, which fall into the so-called range-separated hybrid (RSH) approximation.