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Do not use any kind of "humoristic" pick up lines. Those are reserved for tasteless peasants. Just write her regularly what is she doing, then try to distort convo in something totally irrelevant. As well after few days of chat, ask her about various other stuff, like pets, family and look casual trough whole thing, do not let her know you show any interest in her.
Girls are not rational beings. Remember it.
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