List.UniqueItems lacing

hello everyone,
how does lacing works in List.UniqueItems node? What is the logic behind it? I understand lacing logic for 2 lists in case of a “line by startpoint endpoint” node, but not here. So I tried an example that @Kulkul showed me in one of the cases.

I take an input list with two sublists:

Obviously if I use lacing shortest I get an expected identical list {{“A”,“B”,“C”,“A”},{1,2,2,1,1,1}};
But when I use lacing longest the node works similar to as if I move down a level. So what is the logic behind lacing in this particular node?

not sure but;
When you select lacing shortest;
there is two element to check; first and second list. And these are different lists. This agrees with your example. :smiley:

When you use 2 equal list and add a number at the end.

All collapse :grin:
Always take the first list.

@Ilya_Kirichenko Hope this gives an idea of the intended purpose of levels