#include <bits/stdc++.h> using namespace std; int main() { int T; cin>>T; for (int i=0;i<T;i++){ int n; cin>>n; for (int x=0;x<n;x++){ for (int y=0;y<n;y++){ if (x==y || x+y==n-1){ cout<<'X'; } else{ cout<<" "; } } cout<<"\n"; } cout<<"\n"; } }