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