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| \(a\) | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| \(2a\) (mod 15) | 2 | 4 | 6 | 8 | 10 | 12 | 14 | 1 | 3 | 5 | 7 | 9 | 11 | 13 | 0 |
| \(3a\) (mod 15) | 3 | 6 | 9 | 12 | 0 | 3 | 6 | 9 | 12 | 0 | 3 | 6 | 9 | 12 | 0 |
| \(5a\) (mod 15) | 5 | 10 | 0 | 5 | 10 | 0 | 5 | 10 | 0 | 5 | 10 | 0 | 5 | 10 | 0 |
| \(8a\) (mod 15) | 8 | 1 | 9 | 2 | 10 | 3 | 11 | 4 | 12 | 5 | 13 | 6 | 14 | 7 | 0 |
| \(9a\) (mod 15) | 9 | 3 | 12 | 6 | 0 | 9 | 3 | 12 | 6 | 0 | 9 | 3 | 12 | 6 | 0 |
| \(10a\) (mod 15) | 10 | 5 | 0 | 10 | 5 | 0 | 10 | 5 | 0 | 10 | 5 | 0 | 10 | 5 | 0 |
| \(18a\) (mod 15) | 3 | 6 | 9 | 12 | 0 | 3 | 6 | 9 | 12 | 0 | 3 | 6 | 9 | 12 | 0 |
| \(22a\) (mod 15) | 7 | 14 | 6 | 13 | 5 | 12 | 4 | 11 | 3 | 10 | 2 | 9 | 1 | 8 | 0 |
| \(23a\) (mod 15) | 8 | 1 | 9 | 2 | 10 | 3 | 11 | 4 | 12 | 5 | 13 | 6 | 14 | 7 | 0 |
| \(24a\) (mod 15) | 9 | 3 | 12 | 6 | 0 | 9 | 3 | 12 | 6 | 0 | 9 | 3 | 12 | 6 | 0 |