G

#include <bits/stdc++.h>

using namespace std;

#define ll     long long
#define _test   int _TEST; cin>>_TEST; while(_TEST--)

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);

    _test
    {
        int n;
        cin>>n;

        vector<pair<int, int>> va(n);
        for(auto &[a, b]: va)        cin>>a>>b;

        ll int ans = 0;

        map<int, int> cnt[4];

        for(auto [x, y]: va)
        {
            cnt[0][x]++;
            cnt[1][y]++;
            cnt[2][x-y]++;
            cnt[3][x+y]++;
        }

        for(auto [x, y]: va)
            ans += (cnt[0][x] + cnt[1][y] + cnt[2][x-y] + cnt[3][x+y] - 4);

        cout<<ans<<"\n";
    }
}