A={0, 1, 2, 3, 4, 5}
B={1, 2, 3, 4, 5, 6}
C={0, 2, 4, 6, 8, 10,....}
AUB={0, 1, 2, 3, 4, 5, 6}
A intersectat B={1, 2, 3, 4, 5}
AUC={0, 1, 2, 3, 4, 5, 8, 10, 12,...}
CUB={0, 1, 2, 3, 4, 5, 6, 8, 10, 12,...}
A intersectat C={0, 2, 4}
C intersectat cu B ={2, 4, 6}
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