The combination lock of the suitcase forgot the combination. How to unlock it?

The unlocking method for forgotten password of suitcase is as follows:

1. Shine a flashlight on the iron plate under the box password file to find the small gap in the password file.

2. Put all three spaces on the left, and subtract three from each number on the left, which is the previous password.

3. Then shine a flashlight on the wheels of the password box and look into the gap of each wheel. Turn the steering wheel slowly and find two depressions.

4. Add a large depression.

5, which is the password of this wheel, slide the password again to open it.