C1212121231123232233131323223313231333132322133313232213231232311   >>    C121212123112323223313132322331323133313232213331323221323123231   <<    C1212121231123232233131323223313231333132322133313232213231232313   >>      C1212121231123232233131323223313231333132322133313232213231232312   >>