#include <bits/stdc++.h>
using namespace std;
int32_t main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  long long t;
  cin >> t;
  while (t--) {
    long long n;
    cin >> n;
    long long arr[n];
    vector<long long> even;
    vector<long long> odd;
    for (long long i = 0; i < n; i++) {
      cin >> arr[i];
      if (arr[i] & 1)
        odd.push_back(arr[i]);
      else
        even.push_back(arr[i]);
    }
    if (even.size() % 2 == 0 && odd.size() % 2 == 0)
      cout << "YES\n";
    else {
      long long fl = 0;
      for (auto i : even) {
        for (auto j : odd) {
          if (abs(i - j) == 1) {
            cout << "YES\n";
            fl = 1;
            break;
          }
        }
        if (fl) break;
      }
      if (!fl) cout << "NO\n";
    }
  }
  return 0;
}
