#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  int t;
  cin >> t;
  while (t--) {
    int n;
    cin >> n;
    multiset<int> even, odd;
    for (int i = 0, num; i < n; i++) {
      cin >> num;
      if (num & 1)
        odd.insert(num);
      else
        even.insert(num);
    }
    if (((int)odd.size() + even.size()) % 2 == 1)
      cout << "NO" << endl;
    else {
      if (odd.size() % 2 == 0 && even.size() % 2 == 0)
        cout << "YES" << endl;
      else {
        int flag = 0;
        for (int i : even) {
          if (odd.find(i + 1) != odd.end() || odd.find(i - 1) != odd.end()) {
            flag = 1;
            break;
          }
        }
        if (flag)
          cout << "YES" << endl;
        else
          cout << "NO" << endl;
      }
    }
  }
  return 0;
}
