#include<iostream>
#include<cstring>
using namespace std;


char a[102][102];
int dx[]={ 0,1,0,-1};
int dy[]={-1,0,1,0};

int main(){
	bool fst=true;
	int n;
	cin>>n;
	while(n--){
		memset(a,' ',sizeof(a));
		int m,y,x,dir;
		cin>>m;
		if(m==1){
			if(!fst)cout<<endl;		
			cout<<"#\n";
			fst=false;
			continue;
		}
		y=m;x=1;dir=0;
		a[y][x]='#';
		while(1){
			for(int i=0;i<m-1;i++){
				if(a[y+2*dy[dir]][x+2*dx[dir]]=='#')break;
				y+=dy[dir];
				x+=dx[dir];
				a[y][x]='#';
			}
			dir=(dir+1)%4;
			if(a[y+2*dy[dir]][x+2*dx[dir]]=='#')break;
			if(a[y-1][x-1]=='#'||a[y-1][x+1]=='#'||a[y+1][x-1]=='#'||a[y+1][x+1]=='#')break;
		}
		if(!fst)cout<<endl;
		fst=false;	
		for(int i=1;i<=m;i++){
			for(int j=1;j<=m;j++)cout<<a[i][j];
			cout<<endl;
		}
	}
	return 0;
}