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EXAMPLE
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For n=3, for example, the 49 collinear triples have coordinates (sorting according to the base-n representation of numbers from 0 to n^3-1):
[0, 0, 0], [1, 0, 0], [2, 0, 0]
[0, 0, 0], [0, 1, 0], [0, 2, 0]
[0, 0, 0], [1, 1, 0], [2, 2, 0]
[0, 0, 0], [0, 0, 1], [0, 0, 2]
[0, 0, 0], [1, 0, 1], [2, 0, 2]
[0, 0, 0], [0, 1, 1], [0, 2, 2]
[0, 0, 0], [1, 1, 1], [2, 2, 2]
[1, 0, 0], [1, 1, 0], [1, 2, 0]
[1, 0, 0], [1, 0, 1], [1, 0, 2]
[1, 0, 0], [1, 1, 1], [1, 2, 2]
[2, 0, 0], [1, 1, 0], [0, 2, 0]
[2, 0, 0], [2, 1, 0], [2, 2, 0]
[2, 0, 0], [1, 0, 1], [0, 0, 2]
[2, 0, 0], [2, 0, 1], [2, 0, 2]
[2, 0, 0], [1, 1, 1], [0, 2, 2]
[2, 0, 0], [2, 1, 1], [2, 2, 2]
[0, 1, 0], [1, 1, 0], [2, 1, 0]
[0, 1, 0], [0, 1, 1], [0, 1, 2]
[0, 1, 0], [1, 1, 1], [2, 1, 2]
[1, 1, 0], [1, 1, 1], [1, 1, 2]
[2, 1, 0], [1, 1, 1], [0, 1, 2]
[2, 1, 0], [2, 1, 1], [2, 1, 2]
[0, 2, 0], [1, 2, 0], [2, 2, 0]
[0, 2, 0], [0, 1, 1], [0, 0, 2]
[0, 2, 0], [1, 1, 1], [2, 0, 2]
[0, 2, 0], [0, 2, 1], [0, 2, 2]
[0, 2, 0], [1, 2, 1], [2, 2, 2]
[1, 2, 0], [1, 1, 1], [1, 0, 2]
[1, 2, 0], [1, 2, 1], [1, 2, 2]
[2, 2, 0], [1, 1, 1], [0, 0, 2]
[2, 2, 0], [2, 1, 1], [2, 0, 2]
[2, 2, 0], [1, 2, 1], [0, 2, 2]
[2, 2, 0], [2, 2, 1], [2, 2, 2]
[0, 0, 1], [1, 0, 1], [2, 0, 1]
[0, 0, 1], [0, 1, 1], [0, 2, 1]
[0, 0, 1], [1, 1, 1], [2, 2, 1]
[1, 0, 1], [1, 1, 1], [1, 2, 1]
[2, 0, 1], [1, 1, 1], [0, 2, 1]
[2, 0, 1], [2, 1, 1], [2, 2, 1]
[0, 1, 1], [1, 1, 1], [2, 1, 1]
[0, 2, 1], [1, 2, 1], [2, 2, 1]
[0, 0, 2], [1, 0, 2], [2, 0, 2]
[0, 0, 2], [0, 1, 2], [0, 2, 2]
[0, 0, 2], [1, 1, 2], [2, 2, 2]
[1, 0, 2], [1, 1, 2], [1, 2, 2]
[2, 0, 2], [1, 1, 2], [0, 2, 2]
[2, 0, 2], [2, 1, 2], [2, 2, 2]
[0, 1, 2], [1, 1, 2], [2, 1, 2]
[0, 2, 2], [1, 2, 2], [2, 2, 2]
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