#include <bits/stdc++.h>

#define el '\n'

using namespace std;

using ll = long long;

void solve() {
    int n;
    cin >> n;
    string s[8];
    int flag1 = 1, flag2 = 1;
    cin >> s[1] >> s[7];
    s[1] = " " + s[1];
    s[7] = " " + s[7];
    for (int i =2 ; i <= 6; i++) {
        s[i] = s[1];
    }
    for (int i = 1; i<= n; i++) {
        if (s[1][i] == '.')
            flag1 = 0;
        if (s[7][i] == '.')
            flag2 = 0;
        for (int j = 2; j <= 6; j++) {
            s[j][i] = '.';
        } 
    }
    if (flag1 == 1 && flag2 == 1) {
        cout << "Yes" << el;
        for (int i= 1; i <= 7; i++) {
            for (int j = 1; j <= n; j++) {
                cout << '#';
            }
            cout << el;
        }
        return;
    }
    if (flag1 != flag2) {
        cout << "No" << el;
        return;
    }
    for (int i = 1; i <= n; i++) {
            if (s[1][i] == '#')
                s[2][i] = '.';
            else
                s[2][i] = '#';



            if (s[7][i] == '#')
                s[6][i] = '.';
            else
                s[6][i] = '#';

    }
    int x, y;
    for (int i = 1; i < n; i++) {
        if (s[2][i] == '.' && s[2][i + 1] == '#') {
            x = i;
            break;
        }
        if (s[2][i] == '#' && s[2][i + 1] == '.') {
            x = i + 1;
            break;
        }
    }
    for (int i = 1; i < n; i++) {
        if (s[6][i] == '.' && s[6][i + 1] == '#') {
            y = i;
            break;
        }
        if (s[6][i] == '#' && s[6][i + 1] == '.') {
            y = i + 1;
            break;
        }
    }
    s[3][x] = '#', s[5][y] = '#';
    if (x > y)
        swap(x, y);
    if (x == y) {
        s[4][x] = '#';
    }
    else if (y == x + 1) {
        s[4][x] = '#';
    }
    else {
        for (int i = x + 1; i < y; i++) {
            s[4][i] = '#';
        }
    }
    cout << "Yes" << el;
    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(false);
    cin.tie(0);
    cout.tie(0);
    int T = 1;
    cin >> T;
    while (T--) {
        solve();
    }
    return 0;
}
/*
1
4
#..#
.##.
5
##.#.
.#.##
6
######
.####.
27
.######.######.####.#.#####
.####...####..#.......#####
*/