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10 questions
70 - 50 =
20
40
60 - 40 =
10
80 - 40 =
50
90 - 80 =
30
70 - 30 =
30 - 30 =
60
0
90 - 0 =
90
40 - 30 =
70
80 - 30 =
80 - 60 =
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