#include <bits/stdc++.h>
using namespace std;
const long double pi = 3.14159265358979323;
const double EPS = 1e-12;
const int N = 1e6 + 5;
const int mod = 998244353;
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(NULL);
  cout.tie(NULL);
  long long t, n;
  cin >> t;
  while (t--) {
    cin >> n;
    vector<pair<long long, long long> > v(n);
    long long a[n], b[n];
    map<pair<long long, long long>, long long> mp;
    long long l, r;
    for (int i = 0; i < n; i++) {
      cin >> l >> r;
      a[i] = l, b[i] = r;
      v[i] = {l, r};
    }
    sort(v.begin(), v.end());
    long long maxm = v[0].second, ans = 0;
    mp[{v[0].first, v[0].second}] = 1;
    for (int i = 1; i < n; i++) {
      if (v[i].first > maxm) {
        ans = 1;
        break;
      } else
        mp[{v[i].first, v[i].second}] = 1;
      maxm = max(v[i].second, maxm);
    }
    if (ans) {
      for (int i = 0; i < n; i++) {
        if (mp[{a[i], b[i]}])
          cout << 1 << " ";
        else
          cout << 2 << " ";
      }
    }
    if (!ans) cout << -1;
    cout << "\n";
  }
  return 0;
}
