#include <bits/stdc++.h>
using namespace std;
const int MOD = (int)1e9 + 7;
const int MAX = 1e7;
int arr[MAX];
bool cmp(pair<int, pair<int, int> > &l, pair<int, pair<int, int> > &r) {
  if (l.first < r.first) return 1;
  if (l.first > r.first) return 0;
  if (l.second.first < r.second.first) return 1;
  return 0;
}
int main() {
  ios::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  int t;
  cin >> t;
  while (t--) {
    int n, l, r;
    cin >> n;
    vector<int> v;
    vector<pair<int, pair<int, int> > > p;
    for (int i = 0; i < n; i++) {
      cin >> l >> r;
      p.push_back({r, {l, i}});
    }
    sort(p.begin(), p.end(), cmp);
    int color = 1, x = p[n - 1].second.first, pos = n - 2;
    arr[p[n - 1].second.second] = 1;
    for (int i = n - 2; i >= 0; i--) {
      if (p[i].first >= x) {
        arr[p[i].second.second] = 1;
        x = min(x, p[i].second.first);
      } else {
        pos = i;
        color = 2;
        break;
      }
    }
    for (int i = pos; i >= 0; i--) arr[p[i].second.second] = 2;
    if (color == 1)
      cout << "-1" << endl;
    else {
      for (int i = 0; i < n; i++) cout << arr[i] << " ";
      cout << endl;
    }
  }
  return 0;
}
