#include <iostream>
#include <string>
#include <vector>
using namespace std;

bool pat[104][104];
int dx[4] = {0, 1, 0, -1};
int dy[4] = {-1, 0, 1, 0};

int main() {
    int n, m;
    cin >> n;
    bool lf = false;
    while (n--) {
        cin >> m;
        for (int i=0; i<=m+3; ++i) {
            for (int j=0; j<=m+3; ++j) {
                pat[i][j] = (i == 0 || i == m+3 || j == 0 || j == m+3);
            }
        }
        int x = 2;
        int y = m+1;
        int k = 0;
        while (1) {
            pat[y][x] = true;
            if (pat[y + dy[k] * 2][x + dx[k] * 2]) {
                k = (k + 1) % 4;
            }
            int adj = 0;
            for (int i=0; i<4; ++i) {
                if (pat[y + dy[k] + dy[i]][x + dx[k] + dx[i]]) {
                    adj ++;
                }
            }
            if (1 < adj) {
                break;
            }
            x += dx[k];
            y += dy[k];
        }
        if (lf) {
            cout << endl;
        }
        for (int i=2; i<=m+1; ++i) {
            for (int j=2; j<=m+1; ++j) {
                cout << (pat[i][j] ? "#" : " ");
            }
            cout << endl;
        }
        lf = true;
    }
    return 0;
}