Foto: "<a href="https://ccnull.de/foto/erasing-covid-19-lockdown-text-from-whiteboard-the-symbol-of-the-end-of-the-quarantine/1063140" target="_blank">Erasing COVID-19 lockdown text from whiteboard - the symbol of the end of the quarantine</a>" von <a href="https://ccnull.de/fotograf/marco-verch" target="_blank">Marco Verch</a> via <a href="https://ccnull.de" target="_blank">ccnull.de</a> - <a href="https://www.flickr.com/photos/30478819@N08/51093176652/" target="_blank">Bildquelle</a>, <a href="https://creativecommons.org/licenses/by/2.0/de/" target="_blank">CC-BY 2.0</a>