#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  int t;
  cin >> t;
  for (long long int tc = 1; tc < t + 1; tc++) {
    int n;
    cin >> n;
    vector<int> evn;
    vector<int> odd;
    for (long long int i = 0; i < n; i++) {
      int x;
      cin >> x;
      if (x & 1)
        odd.push_back(x);
      else
        evn.push_back(x);
    }
    if (odd.size() % 2 == 0 && evn.size() % 2 == 0)
      cout << "YES" << endl;
    else {
      bool flag = false;
      for (long long int i = 0; i < evn.size(); i++) {
        for (long long int j = 0; j < odd.size(); j++) {
          if (abs(evn[i] - odd[j]) == 1) {
            flag = true;
            break;
          }
        }
        if (flag) break;
      }
      if (flag)
        cout << "YES" << endl;
      else
        cout << "NO" << endl;
    }
  }
  return 0;
}
