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How Heat decides which instance to delete when it scales in?

I think the title is self-explanatory. Suppose we have a Heat template that scales out (up) to 6 instances with minimum number of instances 2. The scale in factor is -1.

Now, suppose that the instances names are Instance1, Instance2, Instance3, Instance4, Instance5, Instance6 and it's time to scale in. Which instance will be deleted by Heat?