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/*
http://ideone.com/jH9ysX
http://www.practice.geeksforgeeks.org/problem-page.php?pid=453
*/

#include <iostream>
#include <string>
#include <limits.h>
using namespace std; 

int main() {
	int t, n;
	cin >> t;
	while(t--){
		cin >> n;
		int a[51];
		for(int i=0; i<n; i++)
			cin >> a[i];
		
		int max = INT_MIN;
		int secMax = INT_MIN;
		
		for(int i=0; i<n; i++){
			if(a[i] > max){
				secMax = max;
				max = a[i];
			}else if(a[i] > secMax && (a[i] != max)){
				secMax = a[i];
			}
		}
		cout << max * secMax << endl;
	}
	return 0;
}