#include <bits/stdc++.h>

void work() {
    int n; std::cin >> n;
    std::string a, b; std::cin >> a >> b;
    std::string full(n, '#'), empty(n, '.'), ans[7];
    if(a == full && b == full) {
        std::cout << "Yes\n";
        for(int i = 0; i < 7; ++i) std::cout << full << char(10);
        return ;
    }
    if(a == empty || b == empty) {
        std::cout << "Yes\n";
        if(a == empty) for(int i = 0; i < 7; ++i) std::cout << b << char(10);
        else           for(int i = 0; i < 7; ++i) std::cout << a << char(10);
        return ;
    }
    if(a == full || b == full) {
        std::cout << "No\n";
        return ;
    }
    ans[0] = a, ans[6] = b;
    for(int i = 1; i < 6; ++i) ans[i] = empty;
    int l, r;
    for(int i = 0; i < n; ++i) {
        if(a[i] == '#') ans[1][i] = '.'; else ans[1][i] = '#';
        if(b[i] == '#') ans[5][i] = '.'; else ans[5][i] = '#';
    }
    for(int i = 0; i < n; ++i) {
        if(ans[1][i] == '#') continue;
        if(i > 0 && ans[1][i - 1] == '#' || i < n - 1 && ans[1][i + 1] == '#') {
            ans[2][l = i] = '#';
            break;
        }
    }
    for(int i = 0; i < n; ++i) {
        if(ans[5][i] == '#') continue;
        if(i > 0 && ans[5][i - 1] == '#' || i < n - 1 && ans[5][i + 1] == '#') {
            ans[4][r = i] = '#';
            break;
        }
    }
    if(l > r) std::swap(l, r);
    if(std::abs(l - r) <= 1) ans[3][l] = '#'; else {
        for(int i = l + 1; i <= r - 1; ++i) ans[3][i] = '#';
    }

    std::cout << "Yes\n";
    for(int i = 0; i < 7; ++i) std::cout << ans[i] << char(10);
    return ;
}

int main() {
    std::ios::sync_with_stdio(false);
    int T; std::cin >> T; while(T--) work();
    return 0;
}