aftrekken-tussen-1-en-20-reeks-1
Voorbeeld:
20 - 19 = = 1 17 - 10 = = 7 14 - 6 = = 8 10 - 10 = = 0 18 - 13 = = 5 15 - 7 = = 8 11 - 11 = = 0 19 - 15 = = 4 16 - 8 = = 8 12 - 12 = = 0 20 - 16 = = 4 18 - 9 = = 9 13 - 13 = = 0 10 - 7 = = 3 18 - 10 = = 8 14 - 14 = = 0 11 - 8 = = 3 19 - 12 = = 7 15 -15 = = 0 12 -9 = = 3
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