Union
$$A \cup B =$$
{ define, deliver, develop, discover, question, read, recite, review, survey }
Symmetric Difference
$$A \ominus B =$$
{ define, deliver, develop, discover, question, read, recite, review, survey }
Difference
$$A - B =$$
{ define, deliver, develop, discover }
Difference
$$B - A =$$
{ question, read, recite, review, survey }
Cartesian Product
$$A \times B =$$
{ (define, question),
(define, read),
(define, recite),
(define, review),
(define, survey),
(deliver, question),
(deliver, read),
(deliver, recite),
(deliver, review),
(deliver, survey),
(develop, question),
(develop, read),
(develop, recite),
(develop, review),
(develop, survey),
(discover, question),
(discover, read),
(discover, recite),
(discover, review),
(discover, survey) }