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If a VI contains a typedef, you also need to attach the typedef here. (I seem to already have other typdefs in my download folder with the same name, breaking the code instantly). It is also a really bad idea to leave typedefs at the default name for this same reason. Give it a unique and intuitive file name!
Here's a lightweight example for the cluster method. This only works well if all data have the same type. (Else you would need a different input terminal for each type).
This is just a programming example to learn the tools of the trade. Nobody forces you to actually use it in production code. Again, why not keep using global variables? A FGV does not give you any advantage as we already tried to tell you.