Very interesting work. Could results on 'C++' or 'C#' also appear as results for 'C' though? Or is the search strict enough for that not to happen?
""C" named languages are something of a problem. Queries for "C" tend to return results for C# and C++ as well. One way of dealing with this would be to run queries like this: C -C# -C++, however, that unfairly penalizes pages that contain discussions of both C and C++."