Union
$$A \cup B =$$
{ be, do, exist, feel, grammar, logic, love, rhetoric, say, see, think }
Symmetric Difference
$$A \ominus B =$$
{ be, do, exist, feel, grammar, logic, love, rhetoric, say, see, think }
Difference
$$B - A =$$
{ be, do, exist, feel, love, say, see, think }
Cartesian Product
$$A \times B =$$
{ (grammar, be),
(grammar, do),
(grammar, exist),
(grammar, feel),
(grammar, love),
(grammar, say),
(grammar, see),
(grammar, think),
(logic, be),
(logic, do),
(logic, exist),
(logic, feel),
(logic, love),
(logic, say),
(logic, see),
(logic, think),
(rhetoric, be),
(rhetoric, do),
(rhetoric, exist),
(rhetoric, feel),
(rhetoric, love),
(rhetoric, say),
(rhetoric, see),
(rhetoric, think) }
Trivium