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Natural SciencesChemistryPhysicsCrystal StructureMolecular PhysicsPhysical ChemistryAb Initio MethodsAtomic StructureDensity Functional TheoryElectronic StructureMolecular Orbital TheoryMolecular SymmetryAtomic BondingBasis-set ConvergenceElectronic Structure AnalysisFirst-principles Electronic StructureValence Electronic Structure