#include <bits/stdc++.h>
using namespace std;
void solve() {
  long long int n, i;
  cin >> n;
  vector<long long int> a(n), b, c;
  for (i = 0; i < n; i++) cin >> a[i];
  sort(a.begin(), a.end());
  for (i = 0; i < n; i++) {
    if (a[i] % 2 == 0)
      b.push_back(a[i]);
    else
      c.push_back(a[i]);
  }
  long long int s = b.size(), f = c.size();
  long long int check = 0, j;
  if (s % 2 == 0 && f % 2 == 0)
    cout << "YES" << endl;
  else if (s % 2 != 0 && f % 2 != 0) {
    for (i = 0; i < b.size(); i++) {
      for (j = 0; j < c.size(); j++) {
        if (abs(b[i] - c[j]) == 1) {
          check = 1;
          break;
        }
      }
      if (check == 1) break;
    }
    if (check == 1)
      cout << "YES" << endl;
    else
      cout << "NO" << endl;
  } else {
    cout << "NO" << endl;
  }
}
int main() {
  long long int t;
  cin >> t;
  while (t--) {
    solve();
  }
  return 0;
}
