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