Is there a solution set for Knuth's The Art of Computer Programming series? Is there a solution set for the books in The Art of Computer Programming series written by Donald Knuth?

I've found solutions for Concrete Mathematics using Google, but not the above series.
The books contain worked solutions to some exercises and hints to some others. Others are open questions: this is indicated by their difficulty rating, and you shouldn't expect to find worked solutions to them except maybe, for a few, as papers in journals.