import java.util.*;
public class A_Bad_Triangle {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int t = sc.nextInt();
        while(t-- > 0) {
            int n = sc.nextInt();
            int arr[] = new int[n];
            for(int i = 0; i < n; i++) {
                arr[i] = sc.nextInt();
            }
            if(arr[0] + arr[1] <= arr[n-1]) {
                System.out.println(1 + " " + 2 + " " + n);
            }
            else {
                System.out.println(-1);
            }
        }
        sc.close();
    }
}