00:00:00
20
- 5 X 4
30
- 3 X 10
1000
- 10 X 100
3000
- 30 X 100
10000
- 10 X 1000
50000
- 50 X 1000
81
- 9 X 9
64
- 8 X 8
49
- 7 X 7