Data tree problem: I tried to connect points in different groups respectively using tree but failed

[w.wu]

Hello everyone,

Here my problem is very simple: I have two (or more) point groups,

I want to connect any two points in each group by lines, and this can be easily done if I choose points by group and apply data tree,

However, if I want to do it in one step (choose all the points), the tree operation fails and gives me this

although I want like this (here I use the “shift” to show them at the same time)

Here is my GH code and any help and suggestion is so appreciated!
trees-problem.gh (15.0 KB)

[su.lwpac]

Just do the Cross Reference with LowerTriange(Strict) Option

[anon95022132]

trees-problem1.gh (12.5 KB)
try cross reference

[w.wu]

Thank you so much, Su!

[w.wu]

Thank you so much Dai!