As written on the schedule, quiz 1 covers weeks 1 to 3 (included); week 4 (= n-grams) is not part of quiz 1 (but will be in quiz 2 -- that's maybe where the confusion might come from?..)
Generaly speaking: quiz in week N will cover material only up to week N-2
Generaly speaking: quiz in week N will cover material only up to week N-2
