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What problems are Problems known to be in both NP and coNP, but not known whether they are to be in P

One of such problems problem I know is integer factorizationproblem.

What are other interesting problemscases?

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What problems are known to be in both NP and coNP, but not known whether they are in P

One of such problems I know is integer factorization problem.

What are other interesting problems?