#include <bits/stdc++.h>
char g[8][100010];
int main() {
    std::ios::sync_with_stdio(false);
    std::cin.tie(0); std:: cout.tie(0);
    int t; std:: cin >> t;
    while(t--) {
        int n; std::string s1, s2;
        std:: cin >> n >> s1 >> s2;
        if(std::count(s1.begin(), s1.end(),'#') == n && std::count(s2.begin(), s2.end(),'#') != n) {
            std:: cout << "No\n";
            continue;
        }
        if(std::count(s1.begin(), s1.end(),'#') != n && std::count(s2.begin(), s2.end(),'#') == n) {
            std:: cout << "No\n";
            continue;
        }
        std:: cout << "Yes\n";
        if(std::count(s1.begin(), s1.end(),'#') == n && std::count(s2.begin(), s2.end(),'#') == n) {
            for(int i = 1; i <= 7; i++) {
                for(int j = 1; j <= n; j++) {
                    std:: cout << '#';
                }
                std:: cout << '\n';
            }
            continue;
        }
        for(int i = 1; i <= 7; i++)
            for(int j = 1; j <= n; j++)
                g[i][j] = '.';
        for(int i = 1; i <= n; i++) g[1][i] = s1[i - 1];
        for(int i = 1; i <= n; i++) g[2][i] = ((s1[i - 1] == '#') ? '.' : '#');
        for(int i = 1; i <= n; i++) g[7][i] = s2[i - 1];
        for(int i = 1; i <= n; i++) g[6][i] = ((s2[i - 1] == '#') ? '.' : '#');
        if(!std::count(s1.begin(), s1.end(),'#') || !std::count(s2.begin(), s2.end(),'#')) {
            for(int i = 1; i <= 7; i++) {
                for(int j = 1; j <= n; j++) {
                    std:: cout << g[i][j];
                }
                std:: cout << '\n';
            }
            continue;
        }
        int l1 = 0, r1 = 0, l2 = n + 1, r2 = n + 1;
        for(int i = 1; i <= n; i++) {
            if(g[2][i] == '#') {
                l1 = r1 = i;
                while(r1 < n && g[2][r1 + 1] == '#') r1++;
                break;
            }
        }
        for(int i = n; i; i--) {
            if(g[6][i] == '#') {
                l2 = r2 = i;
                while(l2 > 1 && g[6][l2 - 1] == '#') l2--;
                break;
            }
        }
        int x1, x2;
        if(l1 > 1) x1 = l1 - 1;
        else x1 = r1 + 1;
        if(r2 < n) x2 = r2 + 1;
        else x2 = l2 - 1;
        //std:: cout << l1 << ' ' << r1 << ' ' << l2 << ' ' << r2 << '\n';
        g[3][x1] = g[5][x2] = '#';
        if(abs(x1 -x2) <= 1) g[4][x1] = '#';
        else if(x1 < x2) {
            for(int i = x1 + 1; i <= x2 - 1; i++) g[4][i] = '#';
        }  else {
            for(int i = x2 + 1; i <= x1 - 1; i++) g[4][i] = '#';
        }
        for(int i = 1; i <= 7; i++) {
            for(int j = 1; j <= n; j++) {
                std:: cout << g[i][j];
            }
            std:: cout << '\n';
        }
    }
}