B n 1 b 2

B n 1 b 2B n 1 b 2B n 1 b 2B n 1 b 2B n 1 b 2B n 1 b 2
B n 1 b 2B n 1 b 2B n 1 b 2B n 1 b 2B n 1 b 2B n 1 b 2
B n 1 b 2B n 1 b 2B n 1 b 2B n 1 b 2B n 1 b 2B n 1 b 2B n 1 b 2B n 1 b 2B n 1 b 2B n 1 b 2B n 1 b 2B n 1 b 2B n 1 b 2B n 1 b 2B n 1 b 2B n 1 b 2B n 1 b 2B n 1 b 2B n 1 b 2B n 1 b 2B n 1 b 2B n 1 b 2B n 1 b 2B n 1 b 2B n 1 b 2B n 1 b 2B n 1 b 2B n 1 b 2B n 1 b 2B n 1 b 2B n 1 b 2B n 1 b 2B n 1 b 2B n 1 b 2B n 1 b 2B n 1 b 2