#include<bits/stdc++.h> using namespace std; #define po cout<<" " #define xo cout<<"X" #define lo cout<<"\n" 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";} } return 0; }