Best way to cross check list memberships?
I have 9 lists in Marketo that are tied to a CDP and are synced to the CDP with refreshed data. These lists need to be mutually exclusive. Is there an easy way to view that to ensure I am not seeing a contact in 2 or more lists? I started created smart lists comparing 2 at a time so I could pinpoint which lists were overlapping but cross referencing all of them from one another would be messy and would require many smart lists. I ended up exporting all 9 lists separately and added a field to display which list name was exported then combined all of them into one sheet and searched for duplicate email addresses. It gave me what I needed but just wondering if there is a better way to do this in Marketo if I need to check this often.