| http://www.w3.org/ns/prov#value | - are all those 500 problems completely different, or do they group up into several types of problems? if they group up, you might be better served by simply understanding how to do each type of problem rather than actually learning all the problems. if he is picking 30 questions, there is probably 15-30 types of problems there... if those 500 problems are all solved completely differently using diffe
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