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eigenvalues exp[ - ln[beta] * { {0,1,1,1 ,2, 2}, {1, 0 , 2, 2, 1, 1}, {1, 2, 0, 2, 1, 1}, {1,2, 2,0,1, 1 }, {2, 1, 1, 1, 0, 2 }, {2,1,1,1,2,0} } ]