#include<iostream>
#include<cstdio>
using namespace std;
int main()
{
int t,i,n,s,flag=0;
int a[1000001],b[1000001];
scanf("%d\n",&t);
while(t--)
{
scanf("%d\n",&n);
for(i=0;i<n;i++)
scanf("%d\n",&a[i]);
for(i=1;i<n;i++)
{
s=n;
a[0]=1;
a[i]=s;
s--;
}
for(i=0;i<n;i++)
{
if(a[i]==b[i])
flag=0;
else
flag=1;
}
if(flag==0)
printf("ambiguous");
if(flag==1)
printf("not ambiguous");
}
return 0;
}
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