Entry exam in mathematics. Teachers invite the first student:
How much is two plus two?
and three! No is! and five! No is! and six!
It is wrong! Yes... foolish, but looking... we take!
The second student arrives:
How much is two plus two?
and three! No is! and three! No is! and three!
It is wrong! Yes... stupid but shy... take it!
The third student:
How much is two plus two?
Four of course!
Yes... smart. There are no more places!