min[ { N^3 + 6 * N^2 + 11 * N + 6 , N^3 - 6 * N^2 + 11 * N - 6 , N^3 - N , N^3 + 2 * N^2 - N - 2, N^3 - 2 * N^2 - N + 2 } ] for 0.6 < N < 4

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