#define _CRT_SECURE_NO_WARNINGS

#include <iostream>
#include <complex>
#include <string>

using namespace std;

#define loop(i,a,b) for(int i=a; i<int(b); i++)
#define rep(i,b) loop(i,0,b)

double const pi = acos(-1);
typedef complex<int> P;
char a[128][128];
int n;

void solve(){
    rep(i,n+4){
        rep(j,n+4){
            if(i*j==0 || (n+3-i)*(n+3-j)==0)a[i][j]='#';
            else a[i][j]=' ';
        }
        a[i][n+4]='\0';
    }

    P d(-1,0), p(n+1,2);
    while(1){
        a[p.real()][p.imag()]='#';
        int y=p.real(), x=p.imag();
        if(a[y+2*d.real()][x+2*d.imag()]=='#')d/=P(0,1);
        if(a[y+2*d.real()][x+2*d.imag()]=='#')break;
        p+=d;
        int c=0;
        rep(i,4){
            int ny=(p+d).real(), nx=(p+d).imag();
            if(a[ny][nx]=='#')c++;
            d*=P(0,1);
        }
        if(c>1)break;
    }
}

int main(){
    int d;cin>>d;
    rep(x,d){
        cin>>n;
        solve();
        rep(i,n){
            rep(j,n)cout<<a[i+2][j+2];
            cout<<endl;
        }
        if(x+1!=d)cout<<endl;
    }
}