I’m confused

Data Master and Variables

1. Why is it that when I create a data master, a same named variable is created as well?

2. Why is it when I change the name of my data master a new variable is created with the new name and the old variable name remains?

3. What would happen, if I delete the old variable name? Would there be any unwanted side-effects?

4. Is this behaviour intended? or is it a bug?

Thanks.
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