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| # Q3. | |
| "1 2 3 4 5 6 [7] 6 5 4 3 2 1 [0] 1 2 [3] 2 1 0 [-1] 0 1 2 3 4 [5] [4] 5 6" | |
| def pingpong(n): | |
| """Return the nth element of the ping-pong sequence. | |
| >>> pingpong(7) | |
| 7 |