C1212121231123232233131323223313231333131123313112211232313231311   >>    C121212123112323223313132322331323133313112331311221123231323131   <<    C1212121231123232233131323223313231333131123313112211232313231313   >>      C1212121231123232233131323223313231333131123313112211232313231312   >>