Union
$$A \cup B =$$
{ disease, earthquake, fire, flood, hurricane, lightning, metaphysical, meteor, positivity, theological, volcano }
Symmetric Difference
$$A \ominus B =$$
{ disease, earthquake, fire, flood, hurricane, lightning, metaphysical, meteor, positivity, theological, volcano }
Difference
$$A - B =$$
{ disease, earthquake, fire, flood, hurricane, lightning, meteor, volcano }
Cartesian Product
$$A \times B =$$
{ (disease, metaphysical),
(disease, positivity),
(disease, theological),
(earthquake, metaphysical),
(earthquake, positivity),
(earthquake, theological),
(fire, metaphysical),
(fire, positivity),
(fire, theological),
(flood, metaphysical),
(flood, positivity),
(flood, theological),
(hurricane, metaphysical),
(hurricane, positivity),
(hurricane, theological),
(lightning, metaphysical),
(lightning, positivity),
(lightning, theological),
(meteor, metaphysical),
(meteor, positivity),
(meteor, theological),
(volcano, metaphysical),
(volcano, positivity),
(volcano, theological) }
Law of three stages