a = int(input())
s = []
for i in range(a):
    b = int(input())
    c = input().split(' ')
    if int(c[0])+int(c[1]) <= int(c[b-1]):
        s.append(1)
        s.append(2)
        s.append(b)
    else:
        s.append(-1)
for j in range(len(s)-2):
    if s[j] == -1:
        print(-1)
    elif s[j] == 1:
        print(s[j],s[j+1],s[j+2])