Zone Cycle Round Robin

Hi guys and Gals!
I'm trying to achieve a round robin within the same group by using different zones (2 samples within a group).
How do we get to something like this.

I have looked up round robins cycling through groups, but yet to come accross anything that says we can cycle zones...
I have also been able to round robins per velocity, any help appreciated!

As an example C2 would cycle with C1 (if you see what I mean)

 

Just means you'd need to swap which note gets played every other time, seems fairly simple. Have a counter that increments itself like so:

counter := (counter + 1) mod 2

This will always flip between 0 and 1. Now you can multiply this value to create an offset in which note needs to play.