Union
$$A \cup B =$$
{ adenine, agape, cytosine, eros, guanine, philios, storge, thymine }
Symmetric Difference
$$A \ominus B =$$
{ adenine, agape, cytosine, eros, guanine, philios, storge, thymine }
Difference
$$A - B =$$
{ agape, eros, philios, storge }
Difference
$$B - A =$$
{ adenine, cytosine, guanine, thymine }
Cartesian Product
$$A \times B =$$
{ (agape, adenine),
(agape, cytosine),
(agape, guanine),
(agape, thymine),
(eros, adenine),
(eros, cytosine),
(eros, guanine),
(eros, thymine),
(philios, adenine),
(philios, cytosine),
(philios, guanine),
(philios, thymine),
(storge, adenine),
(storge, cytosine),
(storge, guanine),
(storge, thymine) }
The Four Loves