GeoNodes 4.0 : procedural tree (I thought it would be easy - challenge anyone?)

With a few Repeat Zones, I thought it would be straightforward and intuitive to create a procedural/parametric tree.

I could not have been more wrong.

After trying and discarding nearly a dozen "intuitive" approaches, I hit on one that seemed to be headed in the right direction. After more hours of debugging and tweaking, a trivial desired output finally appeared.

I did learn (the hard way) a lot of subtleties and non-intuitive behaviors for some important nodes. BTW I was using 4.0.2.

My challenge criteria would be:

• Number of levels is a parameter
• Number of splits at each level is a parameter
• Extra credit #1: node positions are slightly randomized
• Extra credit #2: each number of splits is slightly randomized