#include <bits/stdc++.h>
using namespace std;
 
using ll = long long;
 
#define loop(i, a, b) for (int (i) = (a); (i) < (b); (i)++) 
 
void solve() {
	int n;
	cin >> n;
	vector<int> a(n);
 
	unordered_map<int, int> freq;
	loop(i, 0, n) 
	{
		cin >> a[i];
		freq[a[i]]++;
	}
	sort(a.begin(), a.end());
 
	int prev = a[0];
	for (int i = 1; i < n; i++) {
		if (a[i] != prev) {
 
			int diff = a[i] - prev; 
 
			if (freq[prev] >= 2) {
 
				if (freq[prev] - 1 >= diff * 2) {
 
					freq[a[i]] += freq[prev] - 2 - (diff - 1) * 2;	
 
				} else if (freq[prev] & 1) {
					cout << "NO" << endl;
					return;
				}
 
			} else {
				cout << "NO" << endl;
				return;
			}
 
			prev = a[i];
		} 
	}
	cout << "YES" << endl;
} 
 
int main() {
	ios::sync_with_stdio(false);
	cin.tie(nullptr); 
	int t;
	cin >> t;
	while (t--) solve();
}

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9
2
1 1
2
2 1
4
1 1 4 4
4
3 4 3 3
4
2 3 4 4
6
3 3 4 5 3 3
6
2 2 2 4 4 4
8
1 1 1 1 1 1 1 4
10
9 9 9 10 10 10 10 10 10 10