Create better lessons quicker
20 + 40 - 60, 70 + 10 - 80, 30+ 40 - 70, 10 + 20 - 30, 40 + 50 - 90, 10 + 10 - 20, 60 - 10 - 50, 100 - 90 - 10, 80 - 40 - 40, 10+90 - 100,

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