#include <iostream>
#include <algorithm>
#define ll long long int
using namespace std;

int main(){
    ll testcases;
    cin>>testcases;
    while(testcases--){
        ll a[4];
        for(int i=0;i<4;i++){
            cin>>a[i];
        }
        sort(a,a+4);
        cout<<a[0]*a[2]<<endl;
    }
    return 0;
}