A := {1, 2, 3, 4};
B := {3, 4, 5, 6};
C := {4, 5};
-- Union, Intersection, Difference, Subset, Equality
print(A + B); -- {1, 2, 3, 4, 5, 6}
print(A * B); -- {3, 4}
print(A - B); -- {1, 2}
print(C subset B); -- #T
print(C = B); -- #F