C1212121231123232233131323223313231333131123313112211232313132313111   >>    C121212123112323223313132322331323133313112331311221123231313231311   <<    C1212121231123232233131323223313231333131123313112211232313132313113   >>      C1212121231123232233131323223313231333131123313112211232313132313112   >>