#include<stdio.h>
#include<iostream>
#include<algorithm>
#define inf 0X7fffffff
using namespace std;
const int N=2e5+9;
int read(int &x){
    int dat=0,oko=1;char chc=getchar();
    while(chc<'0'||chc>'9'){if(chc=='-')oko=-1;chc=getchar();}
    while(chc>='0'&&chc<='9'){dat=dat*10+chc-'0';chc=getchar();}
    x=dat*oko;return x;
}int n,a[8][N],n1,n2,tip,f1,f2,ca,tt,mxx;
//char s1[N],s2[N];
string s1,s2;
void solve(){
    //n=8;
    cin>>n>>s1>>s2;
    if(!mxx)mxx=n;
    // if(tt==10000&&mxx==41){
    //     if(++ca==9099){
    //         cout<<s1<<"\n"<<s2<<"\n";
    //     }else return;
    // }
    n1=0,n2=0;f1=0;f2=0;
    
    //cout<<"ASLDKJ\n";
    for(int i=1;i<=n;i++){
        for(int j=1;j<=7;j++){
            a[j][i]=0;
        }
    }//cout<<"FLaskljd\n";
    
    for(int i=0;i<n;i++){
        // if(rand()&1)s1[i]='#';
        // else s1[i]='.';
        // if(rand()&1)s2[i]='#';
        // else s2[i]='.';
        if(s1[i]=='#'){
            a[1][i+1]=1;n1++;
        }if(s1[i]=='.'){
            a[1][i+1]=0;
        }if(s2[i]=='#'){
            a[7][i+1]=1;n2++;
        }if(s2[i]=='.'){
            a[7][i+1]=0;
        }
    }if(n1==n&&n2==n){
        cout<<"Yes\n";
        for(int i=1;i<=7;i++){
            for(int j=1;j<=n;j++){
                cout<<"#";
            }cout<<"\n";
        }return;
    }if(n1==n||n2==n){
        if(!n1){
            cout<<"Yes\n";
            for(int j=1;j<=6;j++){
                for(int i=1;i<=n;i++){
                    cout<<'.';
                }cout<<"\n";
            }for(int i=1;i<=n;i++){
                cout<<'#';
            }cout<<"\n";
            return;
        }if(!n2){
            cout<<"Yes\n";
            for(int i=1;i<=n;i++){
                cout<<'#';
            }cout<<"\n";
            for(int j=1;j<=6;j++){
                for(int i=1;i<=n;i++){
                    cout<<'.';
                }cout<<"\n";
            }return;
        }
        cout<<"No\n";
        return;
    }
    
    cout<<"Yes\n";
    
    for(int i=1;i<=n;i++){
        if(a[1][i])continue;
        if(i>1&&a[1][i-1]){
            a[2][i]=1;
        }if(i<n&&a[1][i+1]){
            a[2][i]=1;
        }
    }for(int i=1;i<=n;i++){
        if(a[2][i])continue;
        if(i>1&&a[2][i-1])tip=i;
        if(i<n&&a[2][i+1])tip=i;
    }
    a[3][tip]=1;
    for(int i=1;i<=n;i++){
        if(a[7][i])continue;
        if(i>1&&a[7][i-1])a[6][i]=1;
        if(i<n&&a[7][i+1])a[6][i]=1;
        if(a[6][i]&&i==tip-1){f1=1;continue;}
        if(a[6][i]&&i==tip+1){f2=1;continue;}
        a[5][i]=a[6][i];
    }
    //printf("FF %d %d\n",f1,f2);
    if(f1&&f2){
        if(a[6][tip-1]&&a[6][tip-2]){
            a[5][tip-2]=0;
        }if(a[6][tip+1]&&a[6][tip+2]){
            a[5][tip+2]=0;
        }
        a[5][tip]=1;
    }if(f1){
        if(a[6][tip]){
            a[5][tip-2]=1;a[5][tip]=0;
            for(int k=3;tip-k>=1;k++){
                if(!a[5][tip-k])break;
                a[5][tip-k]=0;
            }
        }else {
            a[5][tip]=1;
            for(int k=2;tip-k>=1;k++){
                if(!a[5][tip-k])break;
                a[5][tip-k]=0;
            }
        }
    }if(f2){
        if(a[6][tip]){
            a[5][tip]=0;a[5][tip+2]=1;
            for(int k=3;tip+k<=n;k++){
                if(!a[5][tip+k])break;
                a[5][tip+k]=0;
            }
        }else {
            a[5][tip]=1;
            for(int k=2;tip+k<=n;k++){
                if(!a[5][tip+k])break;
                a[5][tip+k]=0;
            }
        }
    }for(int i=1;i<=n;i++){
        if(a[1][i]||a[3][i])continue;
        a[2][i]=1;
    }for(int i=1;i<=n;i++){
        if(a[1][i])cout<<"#";
        else cout<<".";
    }cout<<"\n";
    for(int i=1;i<=n;i++){
        if(a[2][i])cout<<"#";
        else cout<<".";
    }cout<<"\n";
    for(int i=1;i<=n;i++){
        if(a[3][i])cout<<"#";
        else cout<<".";
    }cout<<"\n";
    for(int i=1;i<=n;i++){
        if(!a[5][i]&&i!=tip)cout<<"#";
        else cout<<".";
    }cout<<"\n";
    for(int i=1;i<=n;i++){
        if(a[5][i])cout<<"#";
        else cout<<".";
    }cout<<"\n";
    for(int i=1;i<=n;i++){
        if(a[6][i])cout<<"#";
        else cout<<".";
    }cout<<"\n";
    for(int i=1;i<=n;i++){
        if(a[7][i])cout<<"#";
        else cout<<".";
    }cout<<"\n";
}
int main(){
    srand(time(0));
    int T;cin>>T;tt=T;
    while(T--)solve();
    return 0;
}
/*
4
8
....#.#.
..##..##
4
#..#
.##.
5
##.#.
.#.##
6
######
.####.
27
.####...####..#.......#####
.######.######.####.#.#####
1
17
.#####.##########
#######..#..#####
1
41
########################.######..########
.#######..######.########################
*/