I did a little more looking, and I found that ONER is movie-making slang for an unusually long take. I'd never heard it used in that context, and other than that it's not found at all in any news article. In any case, that doesn't change the fact that it's a dupe. The general rule is that for most editors you can duplicate "little" words (generally those that aren't capitalize in titles): Articles - a, an, the, coordinating Conjunctions (fewer than five letters) - and, but, or, for, nor, prepositions (fewer than five letters) - on, at, to, from, by. Also you can usually get away with a couple of I's (ISEE, SODOI, etc.)