When I want to express one of the series in harry potter, which one is better? ex) Third episode is my favorite among whole series.

Third episode/ episode three

Are all of them can be used? If not, what is the problem with them?

One more question... In a subway linemap, what is the exact way to express line?

line one = the most common used first line (is it also possible?/ then how about line first?)

I want someone to distinguish their differences as I don't have intuition.



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