C1212121231123232233131323223313232213231333131122233132322331121   >>    C121212123112323223313132322331323221323133313112223313232233112   <<    C1212121231123232233131323223313232213231333131122233132322331123   >>      C1212121231123232233131323223313232213231333131122233132322331122   >>