#include <bits/stdc++.h>
using namespace std;
int main() {
  int t;
  cin >> t;
  while (t--) {
    long long n;
    cin >> n;
    vector<long long> v(n);
    vector<long long> temp(2);
    for (int i = 0; i < n; i++) {
      cin >> v[i];
      temp[v[i] % 2]++;
    }
    long long cnt = 0;
    cnt += temp[0] / 2;
    cnt += temp[1] / 2;
    if (cnt == n / 2)
      cout << "YES"
           << "\n";
    else {
      long long flag = 0;
      sort(v.begin(), v.end());
      for (int i = 0; i < n - 1; i++) {
        if (v[i + 1] - v[i] == 1) cnt++;
        if (cnt == n / 2) {
          cout << "YES"
               << "\n";
          flag = 1;
          break;
        }
      }
      if (flag == 0)
        cout << "NO"
             << "\n";
    }
  }
  return 0;
}
