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There's no general rule of thumb that I know of... I lied, there is Naismith's formula as correctly cited in another answer. I just tend to stay away from it because more often than not I find it ...
Answer
There's no general rule of thumb that I know of... I lied, there is Naismith's formula as correctly cited in another answer. I just tend to stay away from it because more often than not I find it ...