#include <bits/stdc++.h>
using namespace std;
const int MOD = 1000000007;
const int N = 100005;
const int M = 1000005;
int main() {
  std::ios_base::sync_with_stdio(false);
  cin.tie(0);
  cout.tie(0);
  int t;
  cin >> t;
  while (t--) {
    int n;
    cin >> n;
    vector<int> odd, even;
    int a[n];
    for (int i = 0; i < n; i++) {
      cin >> a[i];
      if (a[i] & 1)
        odd.push_back(a[i]);
      else
        even.push_back(a[i]);
    }
    int es = even.size();
    int os = odd.size();
    if (es % 2 == 0 && os % 2 == 0) {
      cout << "YES" << endl;
      continue;
    }
    if (es % 2 == 0 && os & 1) {
      cout << "NO" << endl;
      continue;
    }
    if (os % 2 == 0 && es & 1) {
      cout << "NO" << endl;
      continue;
    }
    int ok = 0;
    for (int i = 0; i < even.size(); i++) {
      for (int j = 0; j < odd.size(); j++) {
        if (abs(even[i] - odd[j]) == 1) {
          ok = 1;
          break;
        }
      }
    }
    if (ok) {
      cout << "YES" << endl;
    } else {
      cout << "NO" << endl;
    }
  }
  return 0;
}
