What are the signs a girl is interested but shy, playing hard to get, or just flat out not interested?

Anonymous
Guys are pretty poor at reading women's behavior and this leads to us getting [or not] signals which we don't interpret properly.

How can GUYS differentiate between these three given that they're so alike?

What signs would you say are in specifically in one category, that are not in the others that would indicate a unique and solid indicator of that category.
What are the signs a girl is interested but shy, playing hard to get, or just flat out not interested?
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