M and b 2

M and b 2M and b 2M and b 2M and b 2M and b 2M and b 2M and b 2M and b 2M and b 2M and b 2M and b 2M and b 2M and b 2M and b 2M and b 2M and b 2M and b 2M and b 2M and b 2M and b 2M and b 2M and b 2M and b 2M and b 2M and b 2M and b 2M and b 2M and b 2M and b 2M and b 2M and b 2M and b 2M and b 2M and b 2M and b 2M and b 2M and b 2M and b 2M and b 2M and b 2M and b 2M and b 2M and b 2M and b 2M and b 2M and b 2M and b 2M and b 2