#include<bits/stdc++.h>
using namespace std;
constexpr int N=1000013;
typedef long long ll;
typedef long double ld;
string s[10];
const char v='#'^'.';
void solve(){
    int n;cin>>n;
    cin>>s[1]>>s[7];
    s[2]=s[1];
    int c1=0;
    for(int i=0;i<n;i++)s[2][i]^=v,c1+=s[2][i]=='#';
    s[6]=s[7];
    int c2=0;
    for(int i=0;i<n;i++)s[6][i]^=v,c2+=s[6][i]=='#';
    if(c1==0&&c2==0){
        cout<<"Yes\n";
        for(int i=1;i<=7;i++)cout<<s[1]<<'\n';
        return;
    }
    if(c1==0||c2==0) {
        cout<<"No\n";
        return;
    }
    cout<<"Yes\n";
    c1=c2=-1;
    for(int i=0;i+1<n;i++)if(s[2][i]=='.'&&s[2][i+1]=='#')c1=i;
    for(int i=0;i+1<n;i++)if(s[6][i]=='.'&&s[6][i+1]=='#')c2=i;
    for(int i=1;i<n;i++)if(s[2][i]=='.'&&s[2][i-1]=='#')c1=i;
    for(int i=1;i<n;i++)if(s[6][i]=='.'&&s[6][i-1]=='#')c2=i;
    s[3]=s[5]=s[4]="";
    for(int i=0;i<n;i++)s[3]+='.',s[5]+='.',s[4]+='.';
    s[3][c1]=s[5][c2]='#';
    if(c1>c2)swap(c1,c2);
    if(c2-c1<=1) {
        s[4][c1]='#';
    }else {
        for(int i=c1+1;i<c2;i++)s[4][i]='#';
    }
    for(int i=1;i<=7;i++)cout<<s[i]<<'\n';

}
//
signed main(){
    int T=1;cin>>T;
    while(T--) solve();
}