Sorting Booleans after Cross Product Lacing

Is it possible to have dynamo specify which items have returned a true bolean value? i am comparing two lists one a master and the other the existing families and their product description parameter in current revit project. i compare them with cross product lacing to see if its correct so each L2 sublist is an item with 260 booleans (one for each name on the master list). so if the L2 sublist has a true boolean value then that item is correct so i only need to know which items returned a list of all false and then filter the original list, which has 19 items, by boolean mask. is this possible?

never mind i figured it out