#include<bits/stdc++.h>
using namespace std;
using i64=long long;
using u64=unsigned long long;
#define ll long long
const int inf=1e9;
const ll inff=1e18;
using i128=__int128;

string ans[8];
void solve(){
	int n;
    cin>>n;
	string fa,fb,a,b;
    cin>>a>>b;
	ans[1]=a;
	ans[7]=b;
	for(auto i:a){
		if(i=='.') fa+='#';
		else fa+='.';
	}
	for(auto i:b){
		if(i=='.') fb+='#';
		else fb+='.';
	}
	string std1(n,'#');
	if(std1==a&&std1!=b||std1==b&&std1!=a){
		cout<<"No"<<'\n';
		return ;
	}
	if(std1==a&&std1==b){
		cout<<"Yes"<<'\n';
		for(int i=1;i<=7;i++){
			cout<<std1<<'\n';
		}
		return;
	}
	ans[2]=fa;
	ans[6]=fb;
	string ss(n,'.');
	string s1=ss;
	ans[3]=s1;
	int pos1=0,pos2=0;
	for(int i=0;i<n;i++){
		if(((i>0&&ans[2][i-1]=='#')||(i<n-1&&ans[2][i+1]=='#'))&&ans[2][i]=='.'){
			ans[3][i]='#';
			pos1=i;
            break;
		}
	}
	ans[5]=s1;
	for(int i=0;i<n;i++){
		if(((i>0&&ans[6][i-1]=='#')||(i<n-1&&ans[6][i+1]=='#'))&&ans[6][i]=='.'){
			ans[5][i]='#';
			pos2=i;
            break; 
		}
	}
	ans[4]=s1;
	if(pos1==pos2){
		ans[4][pos1]='#';
	}else if(abs(pos1-pos2)==1){
		ans[4][pos1]='#'; 
	}else{
		int min1=min(pos1,pos2);
		int max1=max(pos1,pos2);
		for(int i=min1+1;i<max1;i++){
			ans[4][i]='#';
		}
	}
    cout<<"Yes"<<'\n';
	for(int i=1;i<=7;i++){
		cout<<ans[i]<<'\n';
	}
}

int main(){
    ios::sync_with_stdio(0);cin.tie(0);
    int t=1;
    cin>>t; 
    while(t--){
        solve();
    }
    return 0;
}