A question of RandomizeOrder in Dynamo

Can anyone tell what’s wrong with this script? - I am trying to randomly delete three segments of each vertical grids in the curtain wall. The node I am using is RandimizeOrder. However I couldn’t achieve the desired results.

Maybe try to hide all geometry preview except for take items node

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Here is what I get to preview just the takeitems node - It appears most vertical grids are taken.