#include<bits/stdc++.h> using namespace std; int t,n; int main(){ cin>>n; for(int a=1;a<=n;a++){ cin>>t; for(int i=1;i<=t;i++){ for(int j=1;j<=t;j++){ if((j==i)||(i+j==t+1)) cout<<"X"; else cout<<" "; } cout<<endl; } cout<<endl } return 0; }