def f(ais):
	ais = [(ais[i],i+1) for i in range(len(ais))]
	ais.sort()
	a,b,c = ais[:2] + [ais[-1]]
	if a[0] + b[0] <= c[0]:
		return ' '.join(map(str,[a[1],b[1],c[1]]))
	return -1


for u in range(int(raw_input())):
	n = int(raw_input())
	ais = map(int, raw_input().split())
	print f(ais)