There are several questions that are officially "unanswered," but which were effectively answered in the comments. For example, this one was answered by Russell Impagliazzo in the comments. It's been a long time (~5 years), and no better answer is forthcoming. It's a little annoying that this question still appears as "Unanswered." Yet I don't feel comfortable just posting Russell's answer, because then any upvotes it received would go to me instead of Russell. I could of course post a CW answer to avoid getting upvotes myself, but then it precludes Russell from ever posting an answer and getting upvotes. Is there an established norm here?