Exemple: on a {0,4,8} ⊕ {0, 2, 5, 11} = Z/12 Z mais la première partie est 4-périodique.

Mod[Flatten[Outer[Plus, {0, 4, 8}, {0, 2, 5, 11}]], 12]

{0, 2, 5, 11, 4, 6, 9, 3, 8, 10, 1, 7}

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