VISUAL SEMIOTIC ANALYSIS OF GAMIFICATION ELEMENTS IN DUOLINGO GERMAN. Journal of Computation Science and Artificial Intelligence (JCSAI), [S. l.], v. 3, n. 1, p. 1–15, 2026. DOI: 10.58468/jcsai.v3i1.24. Disponível em: https://jcsai.xjurnal.com/index.php/journal/article/view/24. Acesso em: 27 feb. 2026.