jack/PPT @ 113e7847511d3ffa7b4d91e0d4d446ac1a3fe659

jimmylee 113e784751 docs: allow text-only sentence feedback fallback		vor 5 Monaten
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plans	40bf92f5dc docs: plan english speaking task hint modal	vor 5 Monaten
specs	113e784751 docs: allow text-only sentence feedback fallback	vor 5 Monaten