#include <bits/stdc++.h>

using i64 = long long;

void solve()
{
    int n;
    std::cin >> n;
    std::vector<std::string> s(8);
    std::cin >> s[1] >> s[7];
    std::string a = std::string(n, '#');
    if (s[1] == s[7] && s[1] == a) {
        std::cout << "Yes\n";
        for (int i = 1; i <= 7; i++) {
            std::cout << s[1] << "\n";
        }
        return;
    }
    if (s[1] == a || s[7] == a) {
        std::cout << "No\n";
        return;
    }
    for (int i = 2; i <= 6; i++) {
        s[i].resize(n);
    }
    for (int i = 0; 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] = '.';
        }
    }
    for (int i = 0; i < n; i++) {
        for (int j = 3; j <= 5; j++) {
            s[j][i] = '.';
        }
    }
    int l = 1e9, r = 1e9;
    for (int i = 0; i < n; i++) {
        if (s[2][i] == '.') {
            if ((i - 1 >= 0 && s[2][i - 1] == '#') || (i + 1 < n && s[2][i + 1] == '#')) {
                s[3][i] = '#';
                l = i;
                break;
            }
        }
    }
    for (int i = 0; i < n; i++) {
        if (s[6][i] == '.') {
            if ((i - 1 >= 0 && s[6][i - 1] == '#') || (i + 1 < n && s[6][i + 1] == '#')) {
                s[5][i] = '#';
                r = i;
                break;
            }
        }
    }
    if (l == 1e9 || r == 1e9) {
        std::cout << "No\n";
        return;
    }
    // if (std::abs(r - l) == 1) {
    //     std::cout << "No\n";
    //     return;
    // }
    if (l == r) {
        s[4][l] = '#';
    } else if (l < r) {
        if (r - l == 1) {
            s[4][l] = '#';
        } else {
            for (int i = l + 1; i < r; i++) {
                s[4][i] = '#';
            }
        }
        
    } else {
        if (l - r == 1) {
            s[4][r] = '#';
        } else {
            for (int i = r + 1; i < l; i++) {
                s[4][i] = '#';
            } 
        }
    }
    std::cout << "Yes\n";
    for (int i = 1; i <= 7; i++) {
        std::cout << s[i] << "\n";
    }
}
/*
4
4
#..#
.##.
5
##.#.
.#.##
6
######
.####.
27
.######.######.####.#.#####
.####...####..#.......#####
*/

int main()
{
    std::ios::sync_with_stdio(false);
    std::cin.tie(nullptr);

    int _ = 1;
    std::cin >> _;
    while (_--) {
        solve();
    }

   return 0;
}