1. Multiplication table - Advanced
Improve the multiplication table you did in class, by adding column and row headers, and separator lines.
| 1 2 3 4 5 6 7 8 9
---+---------------------------
1| 1 2 3 4 5 6 7 8 9
2| 4 6 8 10 12 14 16 18
3| 9 12 15 18 21 24 27
4| 16 20 24 28 32 36
5| 25 30 35 40 45
6| 36 42 48 54
7| 49 56 63
8| 64 72
9| 81
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