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f(a,b) is set. f(a,b) = a ? b
here are 5 examples (with results) :
1. 1 ? 5 = 1
2. 2 ? 13 = 4
3. 3 ? 15 = 2
4. 7 ? 10 = 3
5. 12 ? 9 = 2
now what is f(a,b) ?
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