C1212121231123232233131323223313233313233313223313123231323223311   >>    C121212123112323223313132322331323331323331322331312323132322331   <<    C1212121231123232233131323223313233313233313223313123231323223313   >>      C1212121231123232233131323223313233313233313223313123231323223312   >>