11369

#include <iostream>
#include <cstdio>
#include <cstring>
#include <string>
#include <vector>
#include <algorithm>

#define ll long long

using namespace std;

vector<int> vb;

bool cmp(int a,int b)
{
	return a>b;
}
int main()
{
	int t,n,a;
	cin>>t;
	ll sum;
	while(t--)
	{
		cin>>n;
		vb.clear();
		for(int i=0;i<n;i++)
		{
			cin>>a;
			vb.push_back(a);
		}
		sort(vb.begin(),vb.end(),cmp);
		if(n<3)
		printf("0\n");
		else
		{
			sum=0;
			for(int i=2;i<n;i+=3)
			sum+=vb[i];
		}
		printf("%lld\n",sum);
	}
	return 0;
}