we will have a great deal of evidence at hand that suggests the following conjectures:
1. All such sequences of differences end with zero after only a few steps.
2. We get zero earliest after only one step(for example, 121 or 999) and at the latest after six steps(for example, 785). There are also three-digit numbers for which we reach zero after two, three, four, or five steps. The next question-Can we tell directly