Fixes #175.
I3S23ZI23V2AG5PEOMDYM7Q2GDCEWS5EKNLZRABFJIYKRU7SKOXQC
4LL3WLONJMVWQTRRWQYJQ2XAZKF2FYRU4IZ7WGRH6YL3PZITVH2QC
A63IHCMXH3F4V56HDXJLJVVHKXRSJCJMT2PWXXI2IW3J734J6SGQC
2GK5DOU7ODF4WBSN3QTD3WIO52VTL2LOAXKGCDEMMAQPTEO4A4HAC
return if -e $link;