1517-9702 1517-9702 S1517-97022023000100636 10.1590/s1678-4634202349252467eng Mexico México 00 00 2023 00 00 2023 49

2019 20 3 3 121-40 2014 98 11836-43 2015 2015 Padova 36-43 2014 179-97 2004 1 2016 6 4 4 59-64 2018 8 3 3 13-5 1965 11 COE. Council of Europe 2018 2015 33 4 4 545-61 DUOLINGO INC. Duolingo 2015 19 1 1 1-9 2019 2012 2017 16 1 1 301-17 2013 3 3 3 404-10 2016 189-200 2018 52 217-27 2011 2019 2019 26 2 2 57-72 1971 3-28 1972 269-93 2010 27 1 1 12-21 1992 75 1 1 96-8 2009 2009 21 2 2 157-65 2018 5 4 4 191-216 2016 29 4 4 703-23 1977 1977 New York 2010 5 375-94 2018 18 4 4 105-25 2016 19 1 1 83-101 2007 24 2 2 97-104 2011 2011 Crete 62-71 2018 15 1 1 10 2014 10 3 3 489-503 2017 2017 Bucharest 303-8 2008 2012 2018 9 1 1 50-8 2013 2008 6 1 1 37-48 2013 2013 21 2 2 27