Validate dropdown values

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Hello.
In my form "Contactos" I have two groups. A normal one called "Contactos" and a repeatable one called "Associar Pessoas". In the repeatable group, I have an element which is a database join (dropdown) which gets values from the list "Pessoas". Let's imagine in my list "Pessoas" I have these values:

View attachment 17269

So, that element in the repeatable group retrieves these 3 values and shows them. If I add two rows to my repeatable group and choose, in the first one, "test1", in the second one it keeps showing me "test1", "test2" and "test3". How can I filter the results so that the "test1", which has been already chosen in the previous row, disappears of the dropdown database join?
 
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