Union
$$A \cup B =$$
{ condensation, deposition, ego, freezing, id, ionization, melting, recombination, sublimation, superego, vaporization }
Symmetric Difference
$$A \ominus B =$$
{ condensation, deposition, ego, freezing, id, ionization, melting, recombination, sublimation, superego, vaporization }
Difference
$$A - B =$$
{ condensation, deposition, freezing, ionization, melting, recombination, sublimation, vaporization }
Cartesian Product
$$A \times B =$$
{ (condensation, ego),
(condensation, id),
(condensation, superego),
(deposition, ego),
(deposition, id),
(deposition, superego),
(freezing, ego),
(freezing, id),
(freezing, superego),
(ionization, ego),
(ionization, id),
(ionization, superego),
(melting, ego),
(melting, id),
(melting, superego),
(recombination, ego),
(recombination, id),
(recombination, superego),
(sublimation, ego),
(sublimation, id),
(sublimation, superego),
(vaporization, ego),
(vaporization, id),
(vaporization, superego) }