from itertools import combinations
t=int(input())
for _ in range(t):
    n=int(input())
    l=list(map(int,input().split()))
    k=tuple()
    for i in combinations(l,3):
        a,b,c=map(int,i)
        if (a+b)<c or a+c<b or b+c<a:
            k=i
            break
    if len(k)==0:
        print("-1")
    else:
        print(l.index(k[0])+1,l.index(k[1])+1,l.index(k[2])+1)

