Input (grade 13): In the show, Korra will have to learn Airbending from master Tenzin, son of Aang and Katara, and contend with an anti-bender revolution taking place in the city.
Output (grade 12): In the show, Korra will have to learn Airbending from master Tenzin, son of Avatar Aang and Katara, and contend with an anti-bender revolution taking place in the city.