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*subst:Unknown_copyright|I don't know exactly * Free licenses: ** PD|PD: public domain ** cc-by-sa-3.0|Creative Commons Attribution-Share Alike 4.0 ** cc-by-sa-4.0|Creative Commons Attribution-Share Alike 4.0 ** cc-by-4.0|Creative Commons Attribution 4.0 ** GFDL|GFDL: |GNU Free Documentation License ** GPL|GPL: |GNU General Public License ** LGPL|LGPL: |GNU Lesser General Public License