Union
$$A \cup B =$$
{ climax, earth, exposition, fall, grass, heaven, lake, mountain, resolution, rise, river, thunder, wood }
Symmetric Difference
$$A \ominus B =$$
{ climax, earth, exposition, fall, grass, heaven, lake, mountain, resolution, rise, river, thunder, wood }
Cartesian Product
$$A \times B =$$
{ (climax, earth),
(climax, grass),
(climax, heaven),
(climax, lake),
(climax, mountain),
(climax, river),
(climax, thunder),
(climax, wood),
(exposition, earth),
(exposition, grass),
(exposition, heaven),
(exposition, lake),
(exposition, mountain),
(exposition, river),
(exposition, thunder),
(exposition, wood),
(fall, earth),
(fall, grass),
(fall, heaven),
(fall, lake),
(fall, mountain),
(fall, river),
(fall, thunder),
(fall, wood),
(resolution, earth),
(resolution, grass),
(resolution, heaven),
(resolution, lake),
(resolution, mountain),
(resolution, river),
(resolution, thunder),
(resolution, wood),
(rise, earth),
(rise, grass),
(rise, heaven),
(rise, lake),
(rise, mountain),
(rise, river),
(rise, thunder),
(rise, wood) }
Dramatic structure