20. The medium of claim 19 , wherein the program instructions are further executable to implement modifying the results according to the received user feedback.
21. The medium of claim 20 , wherein said modifying comprises modifying a ranking of the results, wherein one of the results is ranked higher than another one of the results if the received user feedback specifies a higher level of correctness for the one of the results than a level of correctness specified for the another one of the results.