A={0,1,2,3,4,5,6,7,8}
B={0,1,2,3,4,5,6,7,8,9}
C={1,2,3}
AUB={0,1,2,3,4,5,6,7,8,9}
AUC={0,1,2,3,4,5,6,7,8}
A intersectat B={0,1,2,3,4,5,6,7,8}
A intersectat C={1,2,3}
B intersectat C={1,2,3}
A intersectat B intersectat C={1,2,3}
CU(a intersectat B)={0,1,2,3,4,5,6,7,8}