#include <bits/stdc++.h>
#define ll long long
#define ii __int128
using namespace std;
int n;

void trans(vector<bool>&a,string &s){
    for(int i=0;i<n;i++)
        a[i]=(s[i]=='#'?1:0);
} 
void inv(vector<bool>&a,vector<bool>&b){
    for(int i=0;i<n;i++)b[i]=!a[i];
    if(a[0]==0 && a[1]==0)b[0]=0;
}

bool find(vector<bool>&a,vector<bool>&b){
    //cout<<"here"<<endl;
    int k;
    for(int i=0;i<n;i++)
        if(a[i]==1){
            if(i==0)k=i+1;
            else k=i-1;
            b[k]=1;
            //cout<<k<<" kkk"<<endl;
            return 1;
        }
    return 0;
}

void com(vector<bool>&a,vector<bool>&b,vector<bool>&c){
    int ai=-1,bi=-1;
    for(int i=0;i<n;i++){
        c[i]=0;
        if(a[i]==1 && ai==-1)ai=i;
        if(b[i]==1 && bi==-1)bi=i;
    }
    //cout<<ai<<":"<<bi<<endl;
    if(ai==bi)c[ai]=1;
    else if(abs(ai-bi)==1)c[ai]=1;
    else{
        for(int i=min(ai,bi)+1;i<max(ai,bi);i++)
            c[i]=1;
    }
}


string detrans(vector<bool>&a){
    string s="";
    for(int i=0;i<n;i++)s+=(a[i]==1?'#':'.');
    return s;
}
int main(){
    int _;cin>>_;
    while(_--){
        cin >> n;
        vector<vector<bool>> ans(7,vector<bool>(n));
        string s;
        cin>>s;
        trans(ans[0],s);
        cin >>s ;
        trans(ans[6],s);
        inv(ans[0],ans[1]);
        inv(ans[6],ans[5]);
        bool p1=find(ans[1],ans[2]);
        bool p2=find(ans[5],ans[4]);
        //cout<<p1<<" "<<p2<<endl;
        if(!p1 && !p2){
            for(int i=0;i<n;i++){
                ans[1][i]=ans[2][i]=ans[3][i]=ans[4][i]=ans[5][i]=1;
            }
        }else if(!p1 || !p2){
            cout<<"No"<<endl;
            continue;
        }else{
            com(ans[2],ans[4],ans[3]);
        }
        cout<<"Yes"<<endl;
        for(int i=0;i<=6;i++){
            cout<<detrans(ans[i])<<endl;
            //for(int j=0;j<n;j++)cout<<ans[i][j]<<" ";cout<<endl;
        }
    }
}