#include<bits/stdc++.h>
#define endl '\n'
using namespace std;
const int N=1e5+10;
char c[8][N];
string a,b;
int n;
void out()
{
	cout<<"Yes"<<endl;
	for(int i=1;i<=7;++i)
	{
		for(int j=1;j<=n;++j)
		  cout<<c[i][j];
		cout<<endl;
	}
}
void work()
{
    cin>>n;
    cin>>a>>b;
    a=" "+a;
    b=" "+b;
    for(int i=1;i<=7;++i)
      for(int j=0;j<=n+1;++j)
    	c[i][j]='.';
    int u=0,v=0;
    for(int i=1;i<=n;++i) u+=(a[i]=='.');
    for(int i=1;i<=n;++i) v+=(b[i]=='.');
    if(u==0&&v==0)
    {
    	for(int i=1;i<=7;++i)
    	  for(int j=1;j<=n;++j)
    	    c[i][j]='#';
    	out();
    	return;
	}
	if(u==0||v==0)
	{
		cout<<"No"<<endl;
		return;
	}
    for(int i=1;i<=n;++i) c[1][i]=a[i];
    for(int i=1;i<=n;++i)
    {
    	if(a[i]=='#') c[2][i]='.';
    	else c[2][i]='#';
	}
	int l=0,r=n+1;
	for(int i=1;i<=n;++i)
	  if(c[2][i]=='.'&&(c[2][i-1]=='#'||c[2][i+1]=='#'))
	  {
	  	  l=i;
	  	  break;
	  }
	c[3][l]='#';
	for(int i=1;i<=n;++i)
    {
    	if(b[i]=='#') c[6][i]='.';
    	else c[6][i]='#';
	}
	for(int i=n;i;--i)
	  if(c[6][i]=='.'&&(c[6][i-1]=='#'||c[6][i+1]=='#'))
	  {
	  	  r=i;
	  	  break;
	  }
	c[5][r]='#';
	if(abs(l-r)<=1)
	{
		if(l) c[4][l]='#';
		else c[4][r]='#';
	}
	else
	{
		int minn=min(l,r)+1,maxn=max(l,r)-1;
		for(int i=minn;i<=maxn;++i) c[4][i]='#';
	}
    for(int i=1;i<=n;++i) c[7][i]=b[i];
    out();
}
int main()
{
    ios::sync_with_stdio(false);
    cin.tie(0);
    int T=1;
    cin>>T;
    for(;T;--T)
      work();
    return 0;
}