B 2a

B 2aB 2aB 2aB 2aB 2aB 2a
B 2aB 2aB 2aB 2aB 2aB 2a
B 2aB 2aB 2aB 2aB 2aB 2aB 2aB 2aB 2aB 2aB 2aB 2aB 2aB 2aB 2aB 2aB 2aB 2aB 2aB 2aB 2aB 2aB 2aB 2aB 2aB 2aB 2aB 2aB 2aB 2aB 2aB 2aB 2aB 2aB 2aB 2a