#include <bits/stdc++.h>

using namespace std;
using ll = long long;
#define endl '\n'
const ll inf= 1e17;
const ll mod = 998244353;
void oper(ll testcase) {
    ll n;
    cin>>n;
    vector <vector <char>> s(10,vector <char>(n+1, '.'));
    for(ll i=1;i<=n;i++) cin>>s[1][i];
    for(ll i=1;i<=n;i++) cin>>s[7][i];

    char all1='$',all2='$';
    for(int i=1;i<=n;i++){
        if(s[1][i]==s[1][1]){
            if(i==n){
                all1=s[1][i];
            }
            continue;
        }else{
            break;
        }
    }
    for(int i=1;i<=n;i++){
        if(s[7][i]==s[7][1]){
            if(i==n){
                all2=s[7][i];
            }
            continue;
        }else{
            break;
        }
    }
    if(all1!='$'&&all2!='$'){
        cout<<"Yes"<<endl;
        if(all1=='#'&&all2=='#'){
            for(int i=1;i<=7;i++){
                for(int j=1;j<=n;j++){
                    cout<<"#";
                }
                cout<<endl;
            }
            return;
        }
        if(all1=='#'&&all2=='.'){
            for(int j=1;j<=n;j++){
                cout<<'#';
            }
            cout<<endl;
            for(int i=1;i<=6;i++){
                for(int j=1;j<=n;j++){
                    cout<<".";
                }
                cout<<endl;
            }
            return;
        }
        if(all1=='.'&&all2=='#'){
            for(int j=1;j<=n;j++){
                cout<<'.';
            }
            cout<<endl;
            for(int i=1;i<=6;i++){
                for(int j=1;j<=n;j++){
                    cout<<"#";
                }
                cout<<endl;
            }
            return;
        }
        if(all1=='.'&&all2=='.'){
            for(int i=1;i<=7;i++){
                for(int j=1;j<=n;j++){
                    cout<<".";
                }
                cout<<endl;
            }
            return;
        }
    }

    ll dot1 = -1, dot2 = -1, sharp1 = -1, sharp2 = -1;
    for (ll i = 1; i <= n; ++i)
        if (s[1][i] == '.') {
            dot1 = i;
            break;
        }
    for (ll i = 1; i <= n; ++i)
        if (s[7][i] == '.') {
            dot2 = i;
            break;
        }
    for (ll i = 1; i <= n; ++i)
        if (s[1][i] == '#' && (i >= 2 && s[1][i - 1] == '.' || i <= n - 1 && s[1][i + 1] == '.')) {
            sharp1 = i;
            break;
        }
    for (ll i = 1; i <= n; ++i)
        if (s[7][i] == '#' && (i >= 2 && s[7][i - 1] == '.' || i <= n - 1 && s[7][i + 1] == '.')) {
            sharp2 = i;
            break;
        }
    for (ll i = 1; i <= n; ++i) {
        if (sharp1 != -1 && s[1][i] == '.')
            s[2][i] = '#';
        if (sharp2 != -1 && s[7][i] == '.')
            s[6][i] = '#';
    }
    if ((dot1 == -1) != (dot2 == -1)) {
        cout << "No\n";
        return;
    }
    if (dot1 == -1 && dot2 == -1)
        for (ll p = 2; p <= 6; ++p)
            for (ll i = 1; i <= n; ++i)
                s[p][i] = '#';
    else if (sharp1 != -1 && sharp2 != -1) {
        s[3][sharp1] = '#';
        s[5][sharp2] = '#';
        if (sharp1 > sharp2)
            swap(sharp1, sharp2);
        if (sharp1 + 1 >= sharp2)
            s[4][sharp1] = '#';
        else
            for (ll i = sharp1 + 1; i <= sharp2 - 1; ++i)
                s[4][i] = '#';
    }
    cout<<"Yes"<<endl;
    for(ll i=1;i<=7;i++){
        for(ll j=1;j<=n;j++){
            cout<<s[i][j];
        }
        cout<<endl;
    }
}

int main() {
    ios::sync_with_stdio(false);cin.tie(nullptr);cout.tie(nullptr);
    int ttt = 1;
    cin >> ttt;
    for (ll i = 1; i <= ttt; i++) {
        oper(i);
    }
}