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Wikipedia disagrees: http://en.wikipedia.org/wiki/NP-intermediate

"In computational complexity, problems that are in the complexity class NP but are neither in the class P nor NP-complete are called NP-intermediate"

"Under the assumption that P ≠ NP, Ladner explicitly constructs a problem in NPI, however this problem is artificial and otherwise uninteresting. It is an open question whether any "natural" problem has the same property."

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