Richtig: 0 + 4 = 4, 4 + 0 = 4, 1 + 3 = 4, 3 + 1 = 4, 2 + 2 = 4, Falsch: 1 + 4 = 4, 3 + 0 = 4, 2 + 3 = 4, 2 + 1 = 4, 1 + 2 = 4,

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