#include<bits/stdc++.h>
using namespace std;
int main()
{
int n,x,u,arr[10],t;
cin>>t;
while(t–)
{
cin>>n;
if(n!=0)
{
for(x=1;x<=n;x++)
{
cin>>u;
arr[x]=u;
}
int i,s;
for(x=1;x<=n;x++)
{
if(arr[arr[x]]==x)
{
s=x;
continue;
}
else
{
s=x;
break;}
}
if(s!=n)
{cout<<"not ambiguous";
}
else
{cout<<"ambiguous";
}
}
}
}