#include <iostream>
#include <cstring>
#include <string>
#include <vector>

const int N = 2e5 + 10;

int n;
std::string a, b;
bool st1[N], st2[N];

void solve() {
    memset(st1, false, sizeof(bool) * (n + 1));
    memset(st2, false, sizeof(bool) * (n + 1));

    std::cin >> n >> a >> b;
    int cnt1 = 0, cnt2 = 0;
    for (int i = 0; i < n; i ++) {
        if (a[i] == '.') st1[i] = true;
        else cnt1 ++;
        if (b[i] == '.') st2[i] = true;
        else cnt2 ++;
    }

    if (cnt1 == n || cnt2 == n) {
        if (cnt1 != n || cnt2 != n) std::cout << "No\n";
        else {
            std::cout << "Yes\n";
            for (int i = 1; i <= 7; i ++)
                std::cout << a << '\n';
        }
        return;
    }

    int pos1, pos2;
    for (pos1 = 0; pos1 < n; pos1 ++) {
        if (!st1[pos1]) {
            if (pos1 > 0 && st1[pos1 - 1]) break;
            if (pos1 < n - 1 && st1[pos1 + 1]) break;
        }
    }
    for (pos2 = 0; pos2 < n; pos2 ++) {
        if (!st2[pos2]) {
            if (pos2 > 0 && st2[pos2 - 1]) break;
            if (pos2 < n - 1 && st2[pos2 + 1]) break;
        }
    }

    std::cout << "Yes\n";
    std::cout << a << '\n';
    for (int i = 0; i < n; i ++)
        if (st1[i]) std::cout.put('#');
        else std::cout.put('.');
    std::cout.put('\n');
    for (int i = 0; i < n; i ++)
        if (i == pos1) std::cout.put('#');
        else std::cout.put('.');
    std::cout.put('\n');

    if (pos1 == pos2 || pos1 == pos2 + 1 || pos1 == pos2 - 1) {
        for (int i = 0; i < n; i ++)
            if (i == pos1) std::cout.put('#');
            else std::cout.put('.');
    } else {
        int min = std::min(pos1, pos2), max = std::max(pos1, pos2);
        for (int i = 0; i < n; i ++)
            if (i > min && i < max) std::cout.put('#');
            else std::cout.put('.');
    }
    std::cout.put('\n');

    for (int i = 0; i < n; i ++)
        if (i == pos2) std::cout.put('#');
        else std::cout.put('.');
    std::cout.put('\n');
    for (int i = 0; i < n; i ++)
        if (st2[i]) std::cout.put('#');
        else std::cout.put('.');
    std::cout.put('\n');
    std::cout << b << '\n';
}

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

    int T;
    std::cin >> T;
    while (T --) {
        solve();
    }

    return 0;
}