C1212121231123232233131323223313233313233313223313132333132313231231221   >>    C121212123112323223313132322331323331323331322331313233313231323123122   <<    C1212121231123232233131323223313233313233313223313132333132313231231223   >>      C1212121231123232233131323223313233313233313223313132333132313231231222   >>