I like this girl but I hardly ever see her and when I do see her I never really get a chance to talk to her. How can I ask her out? What do I say?

I would really like to get to know her. I know her name but don't have her number/e-mail or any common friends.
I like this girl but I hardly ever see her and when I do see her I never really get a chance to talk to her. How can I ask her out? What do I say?
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