C1212121231123232233131323223313233313233313223313231323211232311311   >>    C121212123112323223313132322331323331323331322331323132321123231131   <<    C1212121231123232233131323223313233313233313223313231323211232311313   >>      C1212121231123232233131323223313233313233313223313231323211232311312   >>