column #2 is (4,9) and looks to already be sorted correctly

Off by one - index 2 is the third column, (5,10). Also the OP appears to want a reverse sort - at least I'm assuming that based on the $b being before $a and the OP saying the current code doesn't work.

In reply to Re^2: Sorting based on any column by Anonymous Monk
in thread Sorting based on any column by Anonymous Monk

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