Slitherine

Part of the victory conditions say to establish two supply depots on hexes marked "A" As far as I can see, there are three lettered hexes on the scenario map; 9,23 (Letter A) 9,24 (Letter B) and 10,24 (Letter B) Could someone tell me where the second "A" hex is? If you don't establish the two supply depots by a certain turn, you are tagged with a loss, and then you are dismissed.