C1212121231123232233131323223313233313233313223313231323121212221   >>    C121212123112323223313132322331323331323331322331323132312121222   <<    C1212121231123232233131323223313233313233313223313231323121212223   >>      C1212121231123232233131323223313233313233313223313231323121212222   >>