#include <bits/stdc++.h>
using namespace std;
int main() {
// your code goes here
int t,X,Y,c=0;
cin>>t;
while(t--)
{
c=0;
cin>>X>>Y;
while(X<Y){
X=X+8;
c++;
}
cout<<c<<'\n';
}
return 0;
}
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