Questions about example sentences with, and the definition and usage of "Variations"

A: Thanks
Thank you very much.
Thank you so much.
Thanks a lot
Thanks a bunch.
Thanks a million.
Many thanks.
You're the best.
You're a lifesaver.
You're so/too kind.
You're such a dear.
You're an angel.
That's so kind of you.
I appreciate it.
I really appreciate it.
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