From Math stack:This does not provide an answer to the question. Once you have sufficient reputation you will be able to comment on any post; instead, provide answers that don't require clarification from the asker. - From Review – naslundx Does this rule of thumb apply here? A few days ago, I wanted to comment on a question about the propriety of embedding a complete sentence in a sentence, so I asked a question about a sentence with a double dash, in which I had embedded a sentence.

I got away with this subterfuge, but I felt I was just lucky to have escaped punishment. By the way, I knew a teacher of something-or-other who believed that "rule of thumb" derived from an, alas now defunct, English law that allowed a husband to beat his wife with a stick no thicker than his thumb. Rivals "pretzel" I think.

I think there should be a room for questions that have been put on hold. For example, Luc Wyn asked for the meaning of "serendipity" and was told that he could have googled the answer. Here's what I would have said: