import sys

input = sys.stdin.readline


def solve(arr):

    for i in range(len(arr)):
        curr = arr[i]
        start = i+1
        end = len(arr)-1
        while start <=end:
            p1 = arr[start]
            p2 = arr[end]

            if curr + p1 > p2:
                end -= 1
            elif curr + p1 <=p2:
                return print(*[i+1, start+1, end+1])
                
    return -1 

if __name__ == "__main__":

    t = int(input())
    while t:
        n = int(input())
        p = list(map(int, input().split()))
        print(solve(p))
        t = t-1



