bt S 1 bt S 4 bt S 9 bt S 16 bt A 1 bt A 4 bt A 9 bt A 16 bt A 25 bt A 36 bt A 49 bt A 64 bt A 81 bt A 100 bt A 121 bt B 1 bt B 4 bt B 9 bt B 16 bt B 25 bt B 36 bt B 49 bt B 64 bt B 81 bt B 100 bt B 121 bt C 1 bt C 4 bt C 9 bt C 16 bt C 25 bt C 36 bt C 49 bt C 64 bt C 81 bt C 100 bt C 121
