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eigenvalues {{0, -1, 0, 0, 0, -1}, {-1, 0, -1, 0, 0, 0}, {0, -1, 0, -1, 0, 0}, {0, 0, -1, 0, -1, 0}, {0, 0, 0, -1, 0, -1}, {-1, 0, 0, 0, -1, 0}}