Union
$$A \cup B =$$
{ activist, be, do, exist, feel, love, pragmatist, reflector, say, see, theorist, think }
Symmetric Difference
$$A \ominus B =$$
{ activist, be, do, exist, feel, love, pragmatist, reflector, say, see, theorist, think }
Cartesian Product
$$A \times B =$$
{ (activist, be),
(activist, do),
(activist, exist),
(activist, feel),
(activist, love),
(activist, say),
(activist, see),
(activist, think),
(pragmatist, be),
(pragmatist, do),
(pragmatist, exist),
(pragmatist, feel),
(pragmatist, love),
(pragmatist, say),
(pragmatist, see),
(pragmatist, think),
(reflector, be),
(reflector, do),
(reflector, exist),
(reflector, feel),
(reflector, love),
(reflector, say),
(reflector, see),
(reflector, think),
(theorist, be),
(theorist, do),
(theorist, exist),
(theorist, feel),
(theorist, love),
(theorist, say),
(theorist, see),
(theorist, think) }