from math import *
sInt = lambda: int(input())
mInt = lambda: map(int, input().split())
lInt = lambda: list(map(int, input().split()))

t= sInt()


for _ in range(t):
    n = sInt()
    a = lInt()
    ans = [a[0]]
    index = [1]
    for i in range(1,n):
        if a[i] not in ans:
            ans.append(a[i])
            index.append(i+1)
        if len(index) == 3:
            break
    if len(index) == 3:
        print(*index, sep=' ')
    else:
        print(-1)




