Anonymous A: They are very interesting to defeat. B: the knife is so sharp to cut with. A.
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Anonymous A: They are very interesting to defeat. B: the knife is so sharp to cut with.A. "interesting" doesn't take an infinitive like that. You would need "easy" or "hard".
AnonymousMeh is very interesting to talk to.Assuming "Meh" is the name of a person, it's OK.