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Many of the basis sets in this directory are automatically generated from files and scripts in the primitives/ directory, particularly the Dunning correlation-consistent basis sets and some of the Pople basis sets. The primitives/ directory contains subsets of the basis sets that can be combined in various ways (e.g., the diffuse functions and the core-valence functions are often stored in separate files from the main basis set, so that they can be combined in various different ways to produce final basis set files that are then copied up to this directory). If you are thinking of editing these files to update the Psi4 basis set library, especially for Dunning or Pople basis sets, outline your plans in a GitHub issue for advice on how to proceed