CCSD(2) keyword

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4:53:02 PM PST - Mon, Nov 10th 2014
Here is the reference A second-order perturbative correction to the coupled-cluster singles and doubles method: CCSD(2) Gwaltney, Steven R. and Head-Gordon, Martin, The Journal of Chemical Physics, 115, 2014-2021 (2001), DOI:http://dx.doi.org/10.1063/1.1383589