#include <bits/stdc++.h>
using namespace std;
int main() {
  int t;
  cin >> t;
  while (t > 0) {
    long long int i, j, k, l, m, n, o, p;
    cin >> i;
    long long int a[50000];
    for (j = 0; j <= i - 1; j++) {
      cin >> a[j];
    }
    if (a[i - 1] >= a[0] + a[1]) {
      m = 0;
      n = 1;
      o = i - 1;
    }
    if (j <= i - 3) {
      cout << m + 1 << " " << n + 1 << " " << o + 1 << endl;
    } else {
      cout << "-1" << endl;
    }
    t--;
  }
}
