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Found it!

Perhaps you meant 'grep' instead of 'map' ?? ;->

This gives a different result set then mine (larger in every case), but this could be a problem with my code...

It is faster, untill the sets become a teeny weeny bit bigger (eg: +5M lines)

In reply to Re^3: Finding an intersection of two sets, lean and mean by Sinister
in thread Finding an intersection of two sets, lean and mean by Sinister

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