t=int(input())
dict={}
for i in range(t):
    a=input()
    b=input().split(" ")
    m=len(b)
    for i in range(m):
        
        if int(b[0])+int(b[1])>int(b[m-1]):
            print(-1)
            break
            
            
        else:
            print(1,2,m)
            break
            
    
    

