Remove duplicate contact persons

Not sure if this was covered before (couldn't find it), but I have an issue with duplicate contact persons in Zoho Inventory.
Currently trying out the contacts and contact persons import function. All works well, but as I imported the contact persons of my Client contacts multiple times, now each client contact has the same contact person added 3 times!

How can I prevent this and/or de-duplicate contact persons attached to clients/suppliers?

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