#include <bits/stdc++.h>
using namespace std;
int main() {
  int t;
  cin >> t;
  while (t--) {
    int n;
    cin >> n;
    int a[n];
    int even = 0, odd = 0;
    for (int i = 0; i < n; i++) {
      cin >> a[i];
      if (a[i] % 2 == 0)
        even++;
      else
        odd++;
    }
    sort(a, a + n);
    if (even % 2 == 0 && odd % 2 == 0) {
      cout << "YES\n";
      continue;
    }
    int flag = 1;
    for (int i = 1; i < n; i++) {
      if (a[i] - a[i - 1] == 1) {
        cout << "YES\n";
        flag = 0;
        break;
      }
    }
    if (flag) cout << "NO\n";
  }
}
