if __name__ == "__main__":
    t = int(input())
    while(t>0):
        n = int(input())
        to_be_printed = 0
        arr = list(map(int, input().split()))
        for i in range(n-1):
            if(arr[0]+arr[1] > arr[n-1]):
                print(-1)
                break
            elif(arr[0]+arr[i] < arr[n-1]):
                print(0, i, n-1)
                break
        t=t-1

