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Second, all of the 6-31G**++ whatever basis sets are rubbish.  They were
optimized for atomic SCF energies under the (very strong) constraint of
equal valence s and p exponents and this makes them less flexible even than
valence double-zeta.  Other than reproducing someone else's calculations
when necessary, there are much better basis sets of similar size available
in Dalton, although diffuse functions must still be added for any chance of
reliable excited-state calculations.
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