#include<iostream.h>
int main()
{
    int k,i,j,t_case,t_piont,count;
    int x[1000],y[1000];
    cin>>t_case;
    if((t_case<1)&&(t_case>1000)) return 0;
    for(k=0;k<t_case;k++)
    {
        count=0;
        cin>>t_piont;
        for(i=0;i<t_piont;i++)
        {
            cin>>x[i]>>y[i];
      if((x[i]<-10000)&&(x[i]>10000)&&(y[i]<-10000)&&(y[i]>10000))
                return 0;
        }
        count=t_piont/2;
        for(i=0;i<t_piont;i++)
            for(j=i+1;j<t_piont;j++)
            {
                if(x[i]==x[j])
                {
                    if(y[i]==y[j])
                        count--;
                }
            }
        cout<<count<<endl;
    }
    return 0;
}

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