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Courses were developed by professional linguists, and it shows in the pacing. Each concept builds logically, then repeats through guided conversation and review sessions, so phrases stick long enough to use them on a real street, not just a quiz.
1 & x_1 - x_0 & x_1(x_1 - x_0)& \dots & x_1^{n-1}(x_1 - x_0)\\