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EXAMPLE
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The initial antidiagonals are:
[0]
[1, 1]
[2, 0, 2]
[3, 3, 3, 3]
[4, 2, 0, 2, 4]
[5, 5, 4, 1, 5, 5]
[6, 4, 1, 0, 6, 4, 6]
[7, 7, 6, 6, 1, 7, 7, 7]
[8, 6, 5, 7, 0, 6, 4, 6, 8]
[9, 9, 8, 8, 2, 2, 8, 5, 9, 9]
[10, 8, 7, 4, 3, 0, 3, 9, 10, 8, 10]
[11, 11, 10, 5, 9, 9, 1, 8, 5, 11, 11, 11]
[12, 10, 9, 11, 10, 1, 0, 3, 7, 7, 8, 10, 12]
...
The triangle begins:
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12]
[1, 0, 3, 2, 5, 4, 7, 6, 9, 8, 11, 10]
[2, 3, 0, 1, 6, 7, 4, 5, 10, 11, 8]
[3, 2, 4, 0, 1, 6, 8, 9, 5, 7]
[4, 5, 1, 6, 0, 2, 3, 8, 7]
[5, 4, 6, 7, 2, 0, 1, 3]
[6, 7, 5, 8, 3, 9, 0]
[7, 6, 8, 4, 9, 1]
[8, 9, 7, 5, 10]
[9, 8, 10, 11]
[10, 11, 9]
[11, 10]
[12]
...
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