C1212121231123232233131323223313231333132333132322331323331323222311   >>    C121212123112323223313132322331323133313233313232233132333132322231   <<    C1212121231123232233131323223313231333132333132322331323331323222313   >>      C1212121231123232233131323223313231333132333132322331323331323222312   >>