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- You must try to find out a three-digit number. You use a
- stethoscope for this.
- Two buttons at a time are fixed above each number. With one button
- you turn the wheel down and with the other up.
- At every rotation you hear a tone. The right number is reached when
- this tone differs a little bit from the other ones.
- With this method you have to find out the right number for
- every wheel.
- The safe opens automatically when the right combination is set. But
- you have to hurry because you only have a short time of about eight
- seconds before the siren sounds and the police storm the
- strongroom.
-