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We're Fast PSI4 uses the latest techniques like density-fitting, and is optimized for multi-core execution of DFT, MP2, SAPT, and coupled-cluster. We're Modular PSI4 is a C++/Python core that easily interfaces with and is extended by standalone community projects in our growing Software Ecosystem. We're Open Source PSI4 is free and distributed under the truly open-source LGPL3 license. Use in educ