On examination a student took a ticket and at once put back.
- Why did you put a ticket back?
- This was a 13th ticket, and I believe in signs.
it is All this delirium, - a professor said and began to search a 13th ticket.
A student answers ticket on " five".
In a corridor he was surrounded by students ask:
- Really did you everything know?
- And it is not, only the thirteenth ticket.