Obtain values without repeating

[elmachi130]

This is my FB list as you can see the third item is the ZONE

When I get the third items it brings me all

I would like to filter it and not repeat it

get this way

these are my blocks

[Ramon]

Create a new list where you can add the zones.

Get, for each element, the third item and, if it is not in the new list, insert it. If it is already in the list, do not insert it.

This would be the idea:

[elmachi130]

thank you