Union
$$A \cup B =$$
{ agent, condensation, deposition, freezing, ionization, melting, other, product, recombination, sublimation, truth, vaporization }
Symmetric Difference
$$A \ominus B =$$
{ agent, condensation, deposition, freezing, ionization, melting, other, product, recombination, sublimation, truth, vaporization }
Difference
$$A - B =$$
{ condensation, deposition, freezing, ionization, melting, recombination, sublimation, vaporization }
Cartesian Product
$$A \times B =$$
{ (condensation, agent),
(condensation, other),
(condensation, product),
(condensation, truth),
(deposition, agent),
(deposition, other),
(deposition, product),
(deposition, truth),
(freezing, agent),
(freezing, other),
(freezing, product),
(freezing, truth),
(ionization, agent),
(ionization, other),
(ionization, product),
(ionization, truth),
(melting, agent),
(melting, other),
(melting, product),
(melting, truth),
(recombination, agent),
(recombination, other),
(recombination, product),
(recombination, truth),
(sublimation, agent),
(sublimation, other),
(sublimation, product),
(sublimation, truth),
(vaporization, agent),
(vaporization, other),
(vaporization, product),
(vaporization, truth) }
Four discourses