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

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! (15.0 KB)

Just do the Cross Reference with LowerTriange(Strict) Option

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try cross reference

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Thank you so much, Su!

Thank you so much Dai!

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