C1212121231123232233131323223313233313233313223313232213231311311   >>    C121212123112323223313132322331323331323331322331323221323131131   <<    C1212121231123232233131323223313233313233313223313232213231311313   >>      C1212121231123232233131323223313233313233313223313232213231311312   >>