Knock! Knock!
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Who's there!?
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Who
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Who who!?
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Happy birthday to you
Happy birthday to you
Happy birthday, happy birthday, happy birthday to you
Whoooo!
Knock! Knock!
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Who's there!?
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Who
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Who who!?
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Happy birthday to you
Happy birthday to you
Happy birthday, happy birthday, happy birthday to you
Whoooo!