Follow pop - 'follow index'

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Basic query HOW TO USE FOLLOW INDEX
I have particle groups (lemmingsred, lemmingsblue and lemmingsgreen) and 3 leaders (leader1, leader2 and leader3)
I don't know how to control which particle group should follow which leader?
I tried it using follow attribute == $ID%3 and based on this $FOLLOW value grouped them as lemmingsred/green/blue and then using source group and leader group options in the follow tab managed to control which particle group follows which leader. I used 3 follow pop nodes for this but I can not collect their output in one node as these nodes are processing the same particles. Is this the wright way?
I may not be able to comment in this week.

Thanks

Attachments:
pop follow index.hipnc (181.4 KB)

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