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- What you don't know takes a lot of explaining to the children.
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- "What you don't know doesn't hurt you, but it amuses a lot of people."
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- "What you don't know doesn't hurt you, except during an examination."
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- What you don't know doesn't hurt you -- until you find out someone is getting paid for knowing what you don't.
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- "What you don't know won't hurt you, but it may cause you to look pretty silly."
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