Union
$$A \cup B =$$
{ act, causal, check, do, gross, plan, subtle }
Symmetric Difference
$$A \ominus B =$$
{ act, causal, check, do, gross, plan, subtle }
Cartesian Product
$$A \times B =$$
{ (causal, act),
(causal, check),
(causal, do),
(causal, plan),
(gross, act),
(gross, check),
(gross, do),
(gross, plan),
(subtle, act),
(subtle, check),
(subtle, do),
(subtle, plan) }