#include <bits/stdc++.h>
using namespace std;
void solve() {
  long long n, even = 0, odd = 0;
  cin >> n;
  long long ar[n];
  for (long long i = 0; i < n; i++) {
    cin >> ar[i];
    if (ar[i] % 2 == 0) {
      even += 1;
    } else {
      odd += 1;
    }
  }
  if (odd % 2 == 0 && even % 2 != 0) {
    cout << "NO\n";
    return;
  }
  if (odd % 2 != 0 && even % 2 == 0) {
    cout << "NO\n";
    return;
  } else {
    if (odd % 2 == 0) {
      cout << "YES\n";
    } else {
      for (long long i = 0; i < n; i++) {
        for (long long j = i + 1; j < n; j++) {
          if ((ar[i] % 2 != ar[j] % 2) && (abs(ar[i] - ar[j]) == 1)) {
            cout << "YES\n";
            return;
          }
        }
      }
      cout << "NO\n";
    }
  }
}
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  long long t;
  cin >> t;
  for (long long i = 1; i <= t; i++) {
    solve();
  }
  return 0;
}
