QUIZ 5
       (Z)
                             Z NON è:
       |^| 
      /   \           (A)       (B)       (C)
     /     \ 
   |*|      2             2     2   2         2
  /   \            (4 * 5)     4 * 5     4 * 5
 /     \
4       5

(Z)  -/->  (A) | (B) | (C) ?

(Z)  -/->