#include<bits/stdc++.h>
#define endl '\n'
#define ll long long
#define pii pair<ll, ll>
const ll inf = 2e18;
const double eps = 1e-9;
using namespace std;
void slv(){
    ll n; cin >> n;
    string s[8];
    cin >> s[1] >> s[7];
    
    ll f1 = 0, f2 = 0;
    for(auto c:s[1]) {
        if(c == '.') f1 = 1;
    }
    for(auto c:s[7]) {
        if(c == '.') f2 = 1;
    }
    if(!f1 || !f2) {
        if(!f1 && !f2) {
            cout << "Yes" << endl;
            for(int i = 1; i <= 7; ++i) {
                for(int j = 1; j <= n; ++j) {
                    cout << '#';
                }
                cout << endl;
            }
        } else {
            cout << "No" << endl;
        }
        return ;
    }

    
    s[1] = " " + s[1], s[7] = " " + s[7];
    for(int i = 2; i <= 6; ++i) {
        s[i] = s[1];
    }
    for(int i = 2; i <= 6; ++i) {
        for(int j = 1; j <= n; ++j) {
            s[i][j] = '.';
        }
    }
    

    for(int i = 1; i <= n; ++i) {
        if(s[1][i] == '.') {
            s[2][i] = '#';
        }
    }

    for(int i = 1; i <= n; ++i) {
        if(s[7][i] == '.') {
            s[6][i] = '#';
        }
    }

    int p1 = 0, p2 = 0;
    for(int i = 1; i < n; ++i) {
        if(s[2][i] != s[2][i + 1]) {
            if(s[2][i] == '#') {
                s[3][i + 1] = '#';
                p1 = i + 1;
            } else {
                s[3][i] = '#';
                p1 = i;
            }
            break;
        }
    }
    
    for(int i = 1; i < n; ++i) {
        if(s[6][i] != s[6][i + 1]) {
            if(s[6][i] == '#') {
                s[5][i + 1] = '#';
                p2 = i + 1;
            } else {
                s[5][i] = '#';
                p2 = i;
            }
            break;
        }        
    }

    if(abs(p1 - p2) <= 1) {
        s[4][p1] = '#';
    } else {
        for(int i = min(p1, p2) + 1; i <= max(p1, p2) - 1; ++i) {
            s[4][i] = '#';
        }
    }

    cout << "Yes" << endl;
    for(int i = 1; i <= 7; ++i) {
        for(int j = 1; j <= n; ++j) {
            cout << s[i][j];
        }
        cout << endl;
    }
}

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


/*
8
4
#..#
.##.
5
##.#.
.#.##
6
######
.####.
27
.######.######.####.#.#####
.####...####..#.......#####
4
..##
##..
1
#
#
4
####
####
4
#.##
##.#
*/