Let E, F and be three events. Find expressions for the events so that, of E, F and G,

a. Only occurs;

b. Both E and G, but not F, occur;

c. At least one of the events occurs;

d. At least two of the events occur;

e. All three events occur;

f. None of the events occurs;

g. At most one of the events occurs;

h. At most two of the events occur;

i. Exactly two of the events occur;

j. At most three of the events occur.