Union
$$A \cup B =$$
{ adenine, cytosine, familial, friendly, guanine, playful, practical, self-loving, sexual, thymine, universal }
Symmetric Difference
$$A \ominus B =$$
{ adenine, cytosine, familial, friendly, guanine, playful, practical, self-loving, sexual, thymine, universal }
Difference
$$B - A =$$
{ familial, friendly, playful, practical, self-loving, sexual, universal }
Cartesian Product
$$A \times B =$$
{ (adenine, familial),
(adenine, friendly),
(adenine, playful),
(adenine, practical),
(adenine, self-loving),
(adenine, sexual),
(adenine, universal),
(cytosine, familial),
(cytosine, friendly),
(cytosine, playful),
(cytosine, practical),
(cytosine, self-loving),
(cytosine, sexual),
(cytosine, universal),
(guanine, familial),
(guanine, friendly),
(guanine, playful),
(guanine, practical),
(guanine, self-loving),
(guanine, sexual),
(guanine, universal),
(thymine, familial),
(thymine, friendly),
(thymine, playful),
(thymine, practical),
(thymine, self-loving),
(thymine, sexual),
(thymine, universal) }
Nucleobase