The "A12.rar" file contains supplemental software for Errol G. Lewars' textbook, "Computational Chemistry: Introduction to the Theory and Applications of Molecular and Quantum Mechanics," which supports the Hückel Molecular Orbital method, coordinate system modeling, and geometric calculations for molecular behavior. The materials are primarily designed to help users practically apply computational techniques to calculate charge densities and dipole moments. For a detailed outline of procedures associated with these materials, see the Academia.edu paper . (PDF) Computational Chemistry - Academia.edu