Coin Triangles

12 coins are arranged as shown in the figure above. The centers of these coins form various equilateral triangles. (AEF, BJL, DGM, etc.). Your task is to remove minimum number of coins so that no such equilateral triangle remains. Which coins should you remove?

Submit your answer entering the letters of the removed coins in alphabetical order, without any space between the letters.

If you have more than one solution, then enter the solution which comes first alphabetically.

answers: # 87     popularity: 80.6 %     difficulty: 47.2 %