Use of knapsack decoder
1. Step 1: Hold the decoder with one hand, move the cipher wheel with the other hand, and pull out the number one by one. When you find that one of the digital decoders will go deeper, you can pull out the decoder and remember the number.
2. Step 2: Operate the same way as step 1.
3. Step 3: Or the same way as Step 1
4. Step 4: After the above three steps are completed, for example, the number obtained is "7-2-5".
5.Step 5: Subtract "3" from each of the above numbers, and the number "4-9-2" is your password.