#include <bits/stdc++.h>
#define int long long
using namespace std;
 
void solve() {
    int n;
    cin >> n;
    vector<int> v(n+1);
    for(int i=1;i<=n;i++)cin>>v[i];
    sort(v.begin(),v.end());
    vector<int> a(n+1,0),b(n+1,0);
    if(v[1]!=v[2]){
    	cout<<"NO"<<endl;
    	return;
    }
    int k=v[1]+1;
    for(int i=3;i<=n-1;i+=2){
    	int p=v[i],q=v[i+1];
    	if(p>k || q>k){
    		cout<<"NO"<<endl;
    		return;
    	}
    	while(p!=k){
    		p++;
    	}
    	while(q!=k){
    		q++;
    	}
    	k++;
    }
    cout<<"YES"<<endl;
 
}
 
signed main() {
    int t;
    cin >> t;
    while (t--) {
        solve();
    }
    return 0;
}
 

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1 1
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1 1 1 1 1 1 1 4
10
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