t = int(input())
la = []
for index in range(t):
    la.append(int(input()))
    la.append([int(j) for j in input().split()])
v=True
i=1
k=0
while(i<len(la)):
    while(k<len(la[i])):
        if(la[i][0]+la[i][1]<la[i][k]):
            print(1,2,k+1)
            v=False
            break
        k+=1
    i+=2        
    if(v):
        print(-1)
    v=True    
    k=0



