#include <vector>
#include <map>
#include <stack>
#include <queue>
#include <cstring>
#include <string>
#include <sstream>
#include <algorithm>
#include <iomanip>
#include <iostream>

#define rep(i,n) for(int i=0;i<(int)(n);i++)
const int INF = 10000000;
using namespace std;

int main()
{
	char b[100][100];
	int n, d, dx[4]={1, 0, -1, 0}, dy[4]={0, 1, 0, -1};
	
	cin >> d;
	rep(t, d) {
		memset(b, ' ', sizeof(b));
		
		cin >> n;
		rep(i, n) b[0][i]='#';
		int x=0, y=0, nn = n, direct=0;
		
		while (1) {
			for (int i=0; i<nn; i++) {
				b[x][y] = '#';
				x+=dx[direct]; y+=dy[direct];
			}
			x-=dx[direct]; y-=dy[direct];
			direct++; direct%=4;
			
			if (n%2==0 && nn<=2) break;
			
			for (int i=0; i<nn; i++) {
				b[x][y] = '#';
				x+=dx[direct]; y+=dy[direct];
			}
			x-=dx[direct]; y-=dy[direct];
			direct++; direct%=4;
			nn-=2;
			
			if (nn<=1)
				break;
		}
		rep(y, n) {
			rep(x, n)
			cout << b[x][y];
			cout << endl;
		}

	}
	return 0;
}