Create better lessons quicker
12 - 5+7, 8 - 8+0, 20 - 11+9, 19 - 12+7, 16 - 10+6, 4 - 1+3, 15 - 8+7, 14 - 6+8, 13 - 9+4, 11 - 5+6, 10 - 2+8, 9 - 3+6,

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