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How to ask a girl to join your clique
Become their friend if you haven't already.
There's no point in asking someone to join your clique if you've never talked to them before.
Put on a good impression.
You want to give a good impression. If you ask someone to join your clique, then they will need to be able to listen and understand you, instead of noticing the fact that you smell horrible and haven't showered since last week.