Isn't problematic an adjective? Did you mean problem ?
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Grammar Geek I think that the "never end a sentence with a preposition" has been pretty well killed off. In my own opinion, "with which they deal" sounds artificial. I would use your first example. missing a noun remains.)Same here.
Grammarian-botWell guys, according to my search results, problematic is an adjective.
1. Wiktionary http://en.wiktionary.org/wiki/problematic
2. World Web Online