#include <bits/stdc++.h>
#define rep(i, min, max) for(int i = (min); i <= (max); ++i)
#define nrep(i, max, min) for(int i = (max); i >= (min); --i)
#define reads(str) (scanf("%s", str + 1), strlen(str + 1))
#define case() int Ts = read(); rep(T, 1, Ts)
#define putf(flag) puts((flag) ? "Yes" : "No")
#define put(x) printf("%d ", x)
#define putl(x) printf("%lld ", x)
#define endl() putchar('\n')
using namespace std;

void print() { cerr << endl; }
template<typename T, typename ...Ts>
void print(T x, Ts ...xs) { cerr << x << " "; print(xs...); }

typedef long long ll;
inline ll read()
{
    ll now=0; bool nev=false; char c=getchar();
    while(c<'0' || c>'9') { if(c=='-') nev=true; c=getchar(); }
    while(c>='0' && c<='9') { now=(now<<1)+(now<<3)+(c&15); c=getchar(); }
    return nev?-now:now;
}

const int N = 200 + 10;

int main() {
    case() {
        int n = read();
        int xlim = n, ylim = n;
        while((xlim + 1) % 3 != 0) xlim --;
        while((ylim + 1) % 2 != 0) ylim --;
        rep(i, 1, n) {
            rep(j, 1, n) {
                if(j % 2 != 0 && i % 3 != 0 && i <= xlim && j <= ylim) {
                    putchar('#');
                } else putchar('.');
            }
            putchar('\n');
        }
    }
}