Union
$$A \cup B =$$
{ agent, consciousness, feeling, material, mental, other, perception, product, truth }
Symmetric Difference
$$A \ominus B =$$
{ agent, consciousness, feeling, material, mental, other, perception, product, truth }
Difference
$$A - B =$$
{ agent, other, product, truth }
Difference
$$B - A =$$
{ consciousness, feeling, material, mental, perception }
Cartesian Product
$$A \times B =$$
{ (agent, consciousness),
(agent, feeling),
(agent, material),
(agent, mental),
(agent, perception),
(other, consciousness),
(other, feeling),
(other, material),
(other, mental),
(other, perception),
(product, consciousness),
(product, feeling),
(product, material),
(product, mental),
(product, perception),
(truth, consciousness),
(truth, feeling),
(truth, material),
(truth, mental),
(truth, perception) }
Four discourses