for _ in range(int(input())):
    n = int(input())
    a = list(map(int, input().split()))
    s = a[0] + a[1]
    # i = 2
    f = 0
    for i in range(2, n):
        if a[i] >= s:
            print(1, 2, i + 1)
            f = 1
            break
    if f == 0:
        print(-1)