t=int(input())
for i in range(t):
	n=int(input())
	l=list(map(int,input().split()))
	f=0
	if n==3:
		if l[0]+l[1]<=l[2]:
			print(1,2,3,sep=' ')
			f=1
			break
	else:
		for j in range(3,n):
			if l[0]+l[1]<=l[j]:
				print(1,2,j+1,sep=' ')
				f=1
				break
	if f==0:
		print(-1)