A problem is a condition which has to be solved for accessing the result and achieving the desired aim. A problem is an obstacle which makes it difficult to achieve a desired goal, objective or purpose. It refers to a situation, condition, or issue that is yet unresolved.
http://en.wikipedia.org/wiki/Problem
http://www.thefreedictionary.com/problem
http://wordnet.princeton.edu/perl/webwn?s=problem
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