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#include <cstdio>
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#include <cmath>
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using namespace std;
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int main()
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{
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int n;
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double a,b;
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scanf("%d",&n);
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while(n--)
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{
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scanf("%lf%lf",&a,&b);
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printf("%.6lf\n",a<=b?0:log(a/b)+1);
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}
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return 0;
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}
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