Union
$$A \cup B =$$
{ ammo, ballot, jury, lucid, nightmare, ordinary, premonitory, soap, telepathic }
Symmetric Difference
$$A \ominus B =$$
{ ammo, ballot, jury, lucid, nightmare, ordinary, premonitory, soap, telepathic }
Difference
$$A - B =$$
{ lucid, nightmare, ordinary, premonitory, telepathic }
Difference
$$B - A =$$
{ ammo, ballot, jury, soap }
Cartesian Product
$$A \times B =$$
{ (lucid, ammo),
(lucid, ballot),
(lucid, jury),
(lucid, soap),
(nightmare, ammo),
(nightmare, ballot),
(nightmare, jury),
(nightmare, soap),
(ordinary, ammo),
(ordinary, ballot),
(ordinary, jury),
(ordinary, soap),
(premonitory, ammo),
(premonitory, ballot),
(premonitory, jury),
(premonitory, soap),
(telepathic, ammo),
(telepathic, ballot),
(telepathic, jury),
(telepathic, soap) }
Four boxes of liberty