Union
$$A \cup B =$$
{ adenine, blue, cytosine, green, guanine, indigo, orange, red, thymine, violet, yellow }
Symmetric Difference
$$A \ominus B =$$
{ adenine, blue, cytosine, green, guanine, indigo, orange, red, thymine, violet, yellow }
Difference
$$B - A =$$
{ blue, green, indigo, orange, red, violet, yellow }
Cartesian Product
$$A \times B =$$
{ (adenine, blue),
(adenine, green),
(adenine, indigo),
(adenine, orange),
(adenine, red),
(adenine, violet),
(adenine, yellow),
(cytosine, blue),
(cytosine, green),
(cytosine, indigo),
(cytosine, orange),
(cytosine, red),
(cytosine, violet),
(cytosine, yellow),
(guanine, blue),
(guanine, green),
(guanine, indigo),
(guanine, orange),
(guanine, red),
(guanine, violet),
(guanine, yellow),
(thymine, blue),
(thymine, green),
(thymine, indigo),
(thymine, orange),
(thymine, red),
(thymine, violet),
(thymine, yellow) }
Nucleobase