Select items in list A that are not in list B

Hi, it seems like this should be easy, but I’m totally stuck. From the two lists shown here, I want to create a new list: items in list A that are not in list B. (In this scenario, the new list would contain 3 and 4.)

Am I on the right track? I’m using Cross Product lacing. Where to go from here? Thanks…

List.SetDifference does exactly this.

Thanks Nick - I actually just discovered this node…