aftrekken-beneden-10
Voorbeeld:
1-1＝ = 0 2-2＝ = 0 2-1＝ = 1 3-3＝ = 0 3-2＝ = 1 3-1＝ = 2 4-4＝ = 0 4-3＝ = 1 4-2＝ = 2 4-1＝ = 3 5-5＝ = 0 5-4＝ = 1 5-3＝ = 2 5-2＝ = 3 5-1＝ = 4 6-6＝ = 0 6-5＝ = 1 6-4＝ = 2 6-3＝ = 3 6-2＝ = 4 6-1＝ = 5 7-7＝ = 0 7-6＝ = 1 7-3＝ = 4 7-5＝ = 2 7-2＝ = 5 7-4＝ = 3 7-1＝ = 6 8-8＝ = 0 8-7＝ = 1 8-6＝ = 2 8-5＝ = 3 8-4＝ = 4 8-3＝ = 5 8-2＝ = 6 8-1＝ = 7 9-9＝ = 0 9-8＝ = 1 9-7＝ = 2 9-6＝ = 3 9-5＝ = 4 9-4＝ = 5 9-3＝ = 6 9-2＝ = 7 9-1＝ = 8 10-10＝ = 0 10-9＝ = 1 10-8＝ = 2 10-7＝ = 3 10-6＝ = 4 10-5＝ = 5 10-4＝ = 6 10-3＝ = 7 10-2＝ = 8 10-1＝ = 9
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