请教高手，下面的题如何解？

Workers come in types, Good and Bad, who make mistakes with probabilities 0.25 and 0.75. Both are risk averse. Whether a mistake is made is contractible. Employers are risk neutral.

(1) Draw a state-space diagram with a separating equilibrium.

(2) Show why no pooling equilibrium exists.

(3) Draw a state-space diagram so there is no separating equilibrium.

(4) Find the Wilson and reactive equilibrium in the diagram of part (3)