Contributions from threehyphen;body dipole and quadrupole interactions to the third virial coefficients of neon and argon and to the cohesive energy of solid argon are evaluated. In both cases it is found that the triplehyphen;dipole term dominates the nonadditive effect while the dipolemdash;dipolemdash;quadrupole, dipolemdash;quadrupolemdash;quadrupole, and triplehyphen;quadrupole terms are of successively decreasing importance.
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