Comment by sangnoir

> Is “No pornography” a rule? It doesn’t specify any prohibited action and on its own isn’t a complete thought, let alone a rule.

If you were to open a subreddit, or walk up to a library computer/print shop counter and saw "No Pornography" under rules - would you be unable to figure out what's being asked of you? If so, then that seems like a complete thought and a perfectly comprehendible rule to me.