#include<iostream>
using namespace std;

int main(){
    int t;
    cin>>t;
    while(t--){
        int n,a[50010];
        cin>>n;
        for(int i=1;i<=n;i++){
            cin>>a[i];
        }
        if(a[1]+a[2]>a[n]){
            cout<<"-1\n";
        }else{
            cout<<"1 2 "<<n<<"\n";
        }
    }
}