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.