B c 2 m n 2

B c 2 m n 2B c 2 m n 2B c 2 m n 2B c 2 m n 2
B c 2 m n 2B c 2 m n 2B c 2 m n 2B c 2 m n 2B c 2 m n 2B c 2 m n 2B c 2 m n 2B c 2 m n 2
B c 2 m n 2B c 2 m n 2B c 2 m n 2B c 2 m n 2B c 2 m n 2B c 2 m n 2B c 2 m n 2B c 2 m n 2B c 2 m n 2B c 2 m n 2B c 2 m n 2B c 2 m n 2
B c 2 m n 2B c 2 m n 2B c 2 m n 2B c 2 m n 2B c 2 m n 2B c 2 m n 2B c 2 m n 2B c 2 m n 2B c 2 m n 2B c 2 m n 2B c 2 m n 2B c 2 m n 2B c 2 m n 2B c 2 m n 2B c 2 m n 2B c 2 m n 2
B c 2 m n 2B c 2 m n 2B c 2 m n 2B c 2 m n 2B c 2 m n 2B c 2 m n 2B c 2 m n 2B c 2 m n 2