Union
$$A \cup B =$$
{ adenine, cytosine, guanine, question, read, recite, review, survey, thymine }
Symmetric Difference
$$A \ominus B =$$
{ adenine, cytosine, guanine, question, read, recite, review, survey, thymine }
Difference
$$A - B =$$
{ question, read, recite, review, survey }
Difference
$$B - A =$$
{ adenine, cytosine, guanine, thymine }
Cartesian Product
$$A \times B =$$
{ (question, adenine),
(question, cytosine),
(question, guanine),
(question, thymine),
(read, adenine),
(read, cytosine),
(read, guanine),
(read, thymine),
(recite, adenine),
(recite, cytosine),
(recite, guanine),
(recite, thymine),
(review, adenine),
(review, cytosine),
(review, guanine),
(review, thymine),
(survey, adenine),
(survey, cytosine),
(survey, guanine),
(survey, thymine) }
SQ3R