Union
$$A \cup B =$$
{ angry, bored, define, deliver, develop, discover, happy, peaceful }
Symmetric Difference
$$A \ominus B =$$
{ angry, bored, define, deliver, develop, discover, happy, peaceful }
Difference
$$A - B =$$
{ define, deliver, develop, discover }
Difference
$$B - A =$$
{ angry, bored, happy, peaceful }
Cartesian Product
$$A \times B =$$
{ (define, angry),
(define, bored),
(define, happy),
(define, peaceful),
(deliver, angry),
(deliver, bored),
(deliver, happy),
(deliver, peaceful),
(develop, angry),
(develop, bored),
(develop, happy),
(develop, peaceful),
(discover, angry),
(discover, bored),
(discover, happy),
(discover, peaceful) }
Design methods