
def solve(ns):
    a, b, c = ns[0], ns[1], ns[-1]
    if a + b > c:
        return [-1]
    else:
        return [1, 2, len(ns)]

T = int(raw_input())
for case_ in xrange(T):
    n = int(raw_input())
    ns = map(int, raw_input().split())
    for num in solve(ns):
        print num,
    print ''
