I would recomend either Single-O or #1. Shawn Dodson on his website makes a good case for #1. Ayoob also makes a good case for #1 in several of his articles. Both of their reasonnings are logical so #1 is probably a good bet, but if you can't get #1 in your area, use Single-O because it's closer to #1 than OO, and since you cannot get #2.
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