How can the ansible playbook helpernode be used to set up one helper node for 3 clusters.

I am looking at the vars.yaml and I see that there are sections for the clusterid and the nodes.  However, I want to have 3 clusterids and 3 nodes for each cluster.  Is there a way in vars.yaml to set that up? 

If I used 3 different vars.yaml, (vars1.yaml, vars2.yaml vars3.yaml) I assume they would overwrite each other.