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- GNU General Public License, version 21
- Meertens Institute KNAW The Netherlands1
- Only for research and demonstrative purposes1
- RES1
- http://creativecommons.org/licenses/by-nc/3.0/1
- http://creativecommons.org/licenses/by-sa/4.0/1
- http://creativecommons.org/licenses/by/3.0/1
- http://creativecommons.org/licenses/by/4.0/1
- http://www.gnu.org/licenses/gpl-2.0.html1
- https://lindat.mff.cuni.cz/repository/xmlui/page/license-pcedt21