swap number pairs
Swap the numbers in a bunch of 2-element arrays.
Start file
[2, 1], [5, 4] [6, 3] [7, 4] [8, 2], [12, 11]
End file
[1, 2], [4, 5] [3, 6] [4, 7] [2, 8], [11, 12]
View Diff
1,4c1,4 < [2, 1], [5, 4] < [6, 3] < [7, 4] < [8, 2], [12, 11] --- > [1, 2], [4, 5] > [3, 6] > [4, 7] > [2, 8], [11, 12]
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