How to check if repeating group duplicate exists in Database?

I have a repeating group from where i am taking input from the user. In repeating group there can be 2 or 3 or 5 or more input rows.

When someone enters an input in any repeating group row. i want to check if this value exists in the database. If value exists that i want to show a message to the user saying that “There are duplicate values

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