Union
$$A \cup B =$$
{ attaching, cell division, creative, danger, exciting, interphase, keeping still, receptive, resting, serene, soft }
Symmetric Difference
$$A \ominus B =$$
{ attaching, cell division, creative, danger, exciting, interphase, keeping still, receptive, resting, serene, soft }
Difference
$$B - A =$$
{ attaching, creative, danger, exciting, keeping still, receptive, serene, soft }
Cartesian Product
$$A \times B =$$
{ (cell division, attaching),
(cell division, creative),
(cell division, danger),
(cell division, exciting),
(cell division, keeping still),
(cell division, receptive),
(cell division, serene),
(cell division, soft),
(interphase, attaching),
(interphase, creative),
(interphase, danger),
(interphase, exciting),
(interphase, keeping still),
(interphase, receptive),
(interphase, serene),
(interphase, soft),
(resting, attaching),
(resting, creative),
(resting, danger),
(resting, exciting),
(resting, keeping still),
(resting, receptive),
(resting, serene),
(resting, soft) }
Cell cycle