#include <bits/stdc++.h>
const int long long N = 10e8 + 7;
using namespace std;
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(0);
  cout.tie(0);
  int t;
  cin >> t;
  while (t--) {
    int n;
    cin >> n;
    int arr[n];
    vector<int> odd, even;
    for (int i = 0; i < n; i++) {
      cin >> arr[i];
      if (arr[i] % 2 == 0)
        even.push_back(arr[i]);
      else
        odd.push_back(arr[i]);
    }
    int p = int(odd.size()), q = even.size();
    if (p % 2 == 0 && q % 2 == 0) {
      cout << "YES" << '\n';
      continue;
    }
    bool flag = 0;
    for (int i = 0; i < p; i++) {
      for (int j = 0; j < q; j++) {
        if (int(abs(even[j] - odd[i])) == 1) flag = 1;
      }
      if (flag) break;
    }
    if (flag)
      cout << "YES" << '\n';
    else
      cout << "NO" << '\n';
  }
}
