A line of Russian soldiers stands in front of a deep rectangular hole in the ground.

The sergant commands: - "Private Ivanov!" - "Yes, sir." - "Stand like this: O _|______ | | | | | | | | | | ... Jump!!"

The soldier jumps into the hole. The sergeant commands again:

- "Private Pyetrov!!" - "Yes, sir!" - "Stand like this:" | | O \ -|-| | | | | \-\ | | | | | | - "Yes, sir!" - "Jump!"

The soldier jumps and falls into the hole. The sergeant commands again:

- "Private Sidorov!!" - "Yes, sir!" _ "Stand like this:" O |-|-| | | | | | | | | | | | | - "Yes, sir!"

At this point a car with a colonel arrives to that place. The colonel, very angry, comes up to the sergeant and tells him: "Comrade sergeant, how many times do I have to tell you: STOP PLAYING TETRIS WITH THE SOLDIERS!!"