This workflow reads the dataset created by the the workflow named "Counting Loop 2". 1. Of all the Cluster_Membership columns only one is kept (they are all the same anyway). 2. Columns from different iterations (#iter i) are then processed differently. To do that we loop over all columns and one by one we process them using a Column List Loop Start node.
This is a companion discussion topic for the original entry at https://kni.me/w/s2vyqur95p2IJAjQ