Union
$$A \cup B =$$
{ authority, conformity, obedience, question, read, recite, review, self-interest, social contract, survey, universal ethics }
Symmetric Difference
$$A \ominus B =$$
{ authority, conformity, obedience, question, read, recite, review, self-interest, social contract, survey, universal ethics }
Cartesian Product
$$A \times B =$$
{ (authority, question),
(authority, read),
(authority, recite),
(authority, review),
(authority, survey),
(conformity, question),
(conformity, read),
(conformity, recite),
(conformity, review),
(conformity, survey),
(obedience, question),
(obedience, read),
(obedience, recite),
(obedience, review),
(obedience, survey),
(self-interest, question),
(self-interest, read),
(self-interest, recite),
(self-interest, review),
(self-interest, survey),
(social contract, question),
(social contract, read),
(social contract, recite),
(social contract, review),
(social contract, survey),
(universal ethics, question),
(universal ethics, read),
(universal ethics, recite),
(universal ethics, review),
(universal ethics, survey) }