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1. A Game With Digits

2. Write the above number 5 times side by side
1 2 3 4 5

3. 1234512345123451234512345

4. Strike off any ten digits as you like
1234512345123451234512345

5. The remaining digits in the same order make a 15-digit number
134245245135135

6. What is the largest 15-digit number you can make like this?

7. 1234512345123451234512345

8. 553451234512345

10. Can you make another one number?