Union
$$A \cup B =$$
{ act, check, do, efficient (creator), final (function), formal (design), material, plan }
Symmetric Difference
$$A \ominus B =$$
{ act, check, do, efficient (creator), final (function), formal (design), material, plan }
Difference
$$A - B =$$
{ efficient (creator), final (function), formal (design), material }
Cartesian Product
$$A \times B =$$
{ (efficient (creator), act),
(efficient (creator), check),
(efficient (creator), do),
(efficient (creator), plan),
(final (function), act),
(final (function), check),
(final (function), do),
(final (function), plan),
(formal (design), act),
(formal (design), check),
(formal (design), do),
(formal (design), plan),
(material, act),
(material, check),
(material, do),
(material, plan) }