Union
$$A \cup B =$$
{ confrontation, electric, fossil, gravitational, hydric, organic, resolution, setup, solar, thermal, wind }
Symmetric Difference
$$A \ominus B =$$
{ confrontation, electric, fossil, gravitational, hydric, organic, resolution, setup, solar, thermal, wind }
Difference
$$A - B =$$
{ electric, fossil, gravitational, hydric, organic, solar, thermal, wind }
Cartesian Product
$$A \times B =$$
{ (electric, confrontation),
(electric, resolution),
(electric, setup),
(fossil, confrontation),
(fossil, resolution),
(fossil, setup),
(gravitational, confrontation),
(gravitational, resolution),
(gravitational, setup),
(hydric, confrontation),
(hydric, resolution),
(hydric, setup),
(organic, confrontation),
(organic, resolution),
(organic, setup),
(solar, confrontation),
(solar, resolution),
(solar, setup),
(thermal, confrontation),
(thermal, resolution),
(thermal, setup),
(wind, confrontation),
(wind, resolution),
(wind, setup) }
Bagua