z,zz=input,lambda:list(map(int,z().split()));
szz,dgraphs,mod=lambda:sorted(zz()),{},10**9+7
from string import *
from collections import *
from queue import *
from sys import *
from collections import *
from math import *
from heapq import *
from itertools import *
from bisect import *
from collections import Counter as cc
from math import factorial as f
from bisect import bisect as bs
from itertools import accumulate as ac
def lcd(xnum1,xnum2):return (xnum1*xnum2//gcd(xnum1,xnum2))
def prime(x):
    p=ceil(x**.5)+1
    for i in range(2,p):
        if x%i==0 and x!=2:return 0
    return 1
def dfs(u,visit,graph):
    visit[u]=True
    for i in graph[u]:
        if not visit[i]:
            dfs(i,visit,graph)

###########################---Test-Case---#################################
"""




"""
###########################---START-CODING---##############################

num=int(z())

for _ in range(num):
    n=int(z())
    l=zz()
    a=l[0]
    b=l[1]
    c=l[-1]
    if a+b>c and b+c>a and a+c>b:
        print(-1)
    else:
        print(1,2,n)
    
        

    
    
    










    
                
            
