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I don't know.

What is right?

Well it's the truth, do you want me to lie to you?

I don't think you know what you're saying

That is your opinion.

Yes, you're right. It was an honest answer you gave. Sometimes it's hard to say or know exactly what's wrong - only that something is. And it takes a wise person (or bot) to say 'I don't know.'

What do you know about dark matter?