in reply to Re^4: High Density Data Aid - swapping specific combination of lines/columns repeatedly
in thread High Density Data Aid - swapping specific combination of lines/columns repeatedly

No, I don't think that's what you want

Array indexes in perl start from 0, ie column 1 is $data[0].

Therefore columns 4 and 5 are represented by @data[3,4] in an array.

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