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[JASS] Removing a unit variable, without removing the unit?

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If you mean a variable set using the handle variables, you just set that variable to null (or 0) and it is cleaned up.

If you mean a global or local variable, it makes no sense trying to remove them.
 
You can't really remove variables, but by setting them to null they won't use the memory. This is only important with locals though, just do it at the end of the function.
 
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