Give examples to illustrate the symbolism and exaggeration used by tibetan opera masks.

The king's mask is red, and red represents majesty.

The princess's area is green, and green represents suppleness.

The witch's mask is half black and half white, which shows that she has two sides and three knives.

The devil's mask is blue and has fangs to show depression and terror.

The villagers' masks are sewn with white cloth or yellow cloth, and holes are dug in their eyes and lips to show simplicity and generosity.