B s

B sB sB sB sB sB s
B sB sB sB sB sB s
B sB sB sB sB sB sB sB sB sB sB sB sB sB sB sB sB sB sB sB sB sB sB sB sB sB sB sB sB sB sB sB sB sB sB sB s