#include <iostream>
#include <cstring>
using namespace std;
const int dx[] = {0, 1, 0, -1};
const int dy[] = {-1, 0, 1, 0};

void solve(int n) {
	char field[n][n + 1];
	memset(field, ' ', sizeof(field));
	for (int i = 0; i < n; i++) {
		field[i][n] = '\0';
	}
	int x = 0, y = n - 1, d = 0;
	while (true) {
		field[y][x] = '#';
		int newX = x + dx[d];
		int newY = y + dy[d];
		if (newX < 0 || n <= newX || newY < 0 || n <= newY
				|| field[newY+ dy[d]][newX+ dx[d]] == '#') {
			d = (d + 1) % 4;
			newX = x + dx[d];
			newY = y + dy[d];
		}
		int count = 0;
		for (int i = 0; i < 4; i++) {
			int cx = newX + dx[i];
			int cy = newY + dy[i];
			if (0 <= cx && cx < n && 0 <= cy && cy < n && field[cy][cx] == '#') count++;
		}
		if (count > 1) break;
		x = newX;
		y = newY;
	}
	for (int i = 0; i < n; i++) {
		cout << field[i] << endl;
	}
}

int main () {
	int d;
	cin >> d;
	for (int i = 0; i < d; i++) {
		int n;
		cin >> n;
		solve(n);
	}
	return 0;
}