NB. OH! Leave alone the first row. p=: i.@!@<: A. i. p 5 0 1 2 3 4 0 1 2 4 3 0 1 3 2 4 0 1 3 4 2 0 1 4 2 3 0 1 4 3 2 0 2 1 3 4 0 2 1 4 3 0 2 3 1 4 0 2 3 4 1 0 2 4 1 3 0 2 4 3 1 0 3 1 2 4 0 3 1 4 2 0 3 2 1 4 0 3 2 4 1 0 3 4 1 2 0 3 4 2 1 0 4 1 2 3 0 4 1 3 2 0 4 2 1 3 0 4 2 3 1 0 4 3 1 2 0 4 3 2 1
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