Duolingo Period 1: https://www.duolingo.com/o/gqkryw Classroom code: GQKRYW
Duolingo Period 3: https://www.duolingo.com/o/mjqprj Classroom code: MJQPRJ
Duolingo Period 5: https://www.duolingo.com/o/pqyxbt Classroom code: PQYXBT
Duolingo Period 6: https://www.duolingo.com/o/gdmzvk Classroom code: GDMZVK
Google Classroom code: w5r5v2b