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The distinguishable cluster approximation applied to coupled cluster doublesequations greatly improves absolute and relative energies. We apply the sameapproximation to the triples equations and demonstrate that it can also improveresults of the coupled cluster with singles, doubles and triples. The resultingmethod has a nominal computational scaling of ${\cal O}(N^7)$ in the real-spacerepresentation, is orbital invariant, size extensive, and exact for threeelectrons.

On the distinguishable cluster approximation for triple excitations