It seems like there might be a little confusion in your message. Let me clarify a few things:
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"Trouble is a friend" is a common saying that means "trouble is a friend" (a phrase often used to mean that trouble can be beneficial or helpful in the right context). It's not a mistake, but it might be a bit confusing if you're trying to say something else.
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If you meant to say "Trouble is a friend", then the phrase is correct and is often used in a positive way to suggest that trouble can be a good thing.
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If you meant to say something else, like "Trouble is a problem" or "Trouble is a foe", that would be a different meaning.
Would you like to clarify what you meant? I'm here to help!