Union
$$A \cup B =$$
{ enclosure, hearing, hearth, mound, roof, sight, smell, taste, touch }
Symmetric Difference
$$A \ominus B =$$
{ enclosure, hearing, hearth, mound, roof, sight, smell, taste, touch }
Difference
$$A - B =$$
{ hearing, sight, smell, taste, touch }
Difference
$$B - A =$$
{ enclosure, hearth, mound, roof }
Cartesian Product
$$A \times B =$$
{ (hearing, enclosure),
(hearing, hearth),
(hearing, mound),
(hearing, roof),
(sight, enclosure),
(sight, hearth),
(sight, mound),
(sight, roof),
(smell, enclosure),
(smell, hearth),
(smell, mound),
(smell, roof),
(taste, enclosure),
(taste, hearth),
(taste, mound),
(taste, roof),
(touch, enclosure),
(touch, hearth),
(touch, mound),
(touch, roof) }
Sense