18 – 8 – 1 = 10 – 1 = 9.
16 – 6 – 1 = 10 – 1 = 9.
13 – 3 – 4 = 10 – 4 = 6.
17 – 7 – 2 = 10 – 2 = 8.
15 – 5 – 3 = 10 – 3 = 7.
11 – 1 – 5 = 10 – 5 = 5.
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