# include <iostream>
using namespace std;
int main()
{
int partie;
partie<=10;
partie>=1;
float a, b;
cin>>partie;
for(int i=1;i<=partie; i++)
{
cin>>a >>b;
if(a<b)
b-=a;
if(b<a)
a-=b;
cout<<a+b<<"\n"<<endl;
}
return 0;
}
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