Union
$$A \cup B =$$
{ analyst, hysteric, master, preview, question, read, summarize, test, university }
Symmetric Difference
$$A \ominus B =$$
{ analyst, hysteric, master, preview, question, read, summarize, test, university }
Difference
$$A - B =$$
{ analyst, hysteric, master, university }
Difference
$$B - A =$$
{ preview, question, read, summarize, test }
Cartesian Product
$$A \times B =$$
{ (analyst, preview),
(analyst, question),
(analyst, read),
(analyst, summarize),
(analyst, test),
(hysteric, preview),
(hysteric, question),
(hysteric, read),
(hysteric, summarize),
(hysteric, test),
(master, preview),
(master, question),
(master, read),
(master, summarize),
(master, test),
(university, preview),
(university, question),
(university, read),
(university, summarize),
(university, test) }
Four discourses