'''input
3
7
4 6 11 11 15 18 20
4
10 10 10 11
3
1 1 1000000000

'''
 

 
from bisect import bisect_right as bl
from random import randint as R
import heapq

RI = lambda : [int(_x) for _x in raw_input().split()]


for _ in range(input()):
	n = input()
	A= RI()

	if A[0]+A[1]<=A[-1]:
		print 1,2,n
	else:
		print -1