#include<bits/stdc++.h> using namespace std; int n,t; int main(){ cin>>t; while(t--){cin>>n;for(int i=1;i<=n;i++){for(int j=1;j<=n;j++)cout<<((j==i)+(j==n-i+1)?"X":" ");cout<<"\n";}cout<<"\n";} return 0; }