Is NP countable?

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Is NP countable?

I am confused with this problem. I think it is not countable but I am not sure. Can someone prove whether it is countable?

Please show your proof. Thank you for your time!

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A problem is NP if there is a non-deterministic Turing machine which computes the answer in polynomial time.

Are there uncountably many non-deterministic Turing machines are there?