#include<iostream>
#include<stdio.h>
#include<algorithm>
using namespace std;
typedef long long ll;
ll getshu(ll a,ll c)
{
while(1)
{if(c%a==0)
{return a;break;}
ll tep=c;
c=a;
a=tep%a;}
}
int main()
{
int t;
cin>>t;
while(t--)
{
ll fl,fr,sl,sr;
cin>>fl>>fr>>sl>>sr;
ll ans=0;
if(fr<sl||sr<fl)cout<<"0/1"<<endl;
else
{
if(fl<=sl&&fr>=sl)
{
if(fr<=sr)ans+=fr-sl+1;
else ans+=sr-sl+1;
}
if(sl<fl&&sr>=fl)
{
if(sr<=fr)ans+=sr-fl+1;
else ans+=fr-fl+1;
}
ll f1=fr-fl+1,f2=sr-sl+1;
ll fz=f1*f2;
ll chu=getshu(ans,fz);
cout<<ans/chu<<"/"<<fz/chu<<endl;
}
}
}