I wrote a recursive perform tired to create a new one when change only a row if the structure is the same(I coded different WHEN clause within). Of course I make a set and a reset of variable when I'm calling and returning but what really means Unpredictable is really obscure... I suppose that a program in another language is unpredictable too if you avoid to code an exit point...(I think a basic factorial function...) Maybe depend on what a programmer thinks to be returned? A new instance with isolated variables?
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