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