Union
$$A \cup B =$$
{ free flow, friend, handmaid, master, praiseworthy, sister, synchronized flow, undesirable, wasteful, wide moving jam }
Symmetric Difference
$$A \ominus B =$$
{ free flow, friend, handmaid, master, praiseworthy, sister, synchronized flow, undesirable, wasteful, wide moving jam }
Difference
$$B - A =$$
{ friend, handmaid, master, praiseworthy, sister, undesirable, wasteful }
Cartesian Product
$$A \times B =$$
{ (free flow, friend),
(free flow, handmaid),
(free flow, master),
(free flow, praiseworthy),
(free flow, sister),
(free flow, undesirable),
(free flow, wasteful),
(synchronized flow, friend),
(synchronized flow, handmaid),
(synchronized flow, master),
(synchronized flow, praiseworthy),
(synchronized flow, sister),
(synchronized flow, undesirable),
(synchronized flow, wasteful),
(wide moving jam, friend),
(wide moving jam, handmaid),
(wide moving jam, master),
(wide moving jam, praiseworthy),
(wide moving jam, sister),
(wide moving jam, undesirable),
(wide moving jam, wasteful) }
Three-phase traffic theory