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EXAMPLE
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Triangle begins:
0;
0, 0;
1, 0, 1;
1, 0, 0, 1;
2, 1, 0, 1, 2;
2, 1, 0, 0, 1, 2;
3, 2, 1, 0, 1, 2, 3;
3, 2, 1, 0, 0, 1, 2, 3;
4, 3, 2, 1, 0, 1, 2, 3, 4;
4, 3, 2, 1, 0, 0, 1, 2, 3, 4;
5, 4, 3, 2, 1, 0, 1, 2, 3, 4, 5;
5, 4, 3, 2, 1, 0, 0, 1, 2, 3, 4, 5;
6, 5, 4, 3, 2, 1, 0, 1, 2, 3, 4, 5, 6;
6, 5, 4, 3, 2, 1, 0, 0, 1, 2, 3, 4, 5, 6;
7, 6, 5, 4, 3, 2, 1, 0, 1, 2, 3, 4, 5, 6, 7;
7, 6, 5, 4, 3, 2, 1, 0, 0, 1, 2, 3, 4, 5, 6, 7;
8, 7, 6, 5, 4, 3, 2, 1, 0, 1, 2, 3, 4, 5, 6, 7, 8;
8, 7, 6, 5, 4, 3, 2, 1, 0, 0, 1, 2, 3, 4, 5, 6, 7, 8;
9, 8, 7, 6, 5, 4, 3, 2, 1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9;
9, 8, 7, 6, 5, 4, 3, 2, 1, 0, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9;
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