C1212121231123232233131323223313233313233313223313132313232211321   >>    C121212123112323223313132322331323331323331322331313231323221132   <<    C1212121231123232233131323223313233313233313223313132313232211323   >>      C1212121231123232233131323223313233313233313223313132313232211322   >>