#include <bits/stdc++.h>
using namespace std;
#define int long long


void solve(){
	int n;
	cin >> n;
	vector<string> a(7);
	cin >> a[0] >> a[6];
	bool f0 = false, f6 = false;
	for(char c : a[0])
		f0 |= (c == '.');
	for(char c : a[6])
		f6 |= (c == '.');
	if(f0 != f6) {
		cout << "No\n";
		return;
	}
	cout << "Yes\n";
	if(f0 == false) {
		for(int i = 0; i < 7; i ++) cout << a[0] << "\n";
		return;
	}
	for(int i = 1; i < 6; i ++) a[i] = string(n, '.');
	for(int i = 0; i < n; i ++)	if(a[0][i] == '.') a[1][i] = '#';
	for(int i = 0; i < n; i ++)	if(a[6][i] == '.') a[5][i] = '#';
	int l = -1, r = -1;
	for(int i = 0; i < n and l == -1; i ++) {
		if(a[1][i] == '#') continue;
		if(i - 1 >= 0 and a[1][i - 1] == '#') l = i;
		if(i + 1 < n  and a[1][i + 1] == '#') l = i;
	}

	for(int i = 0; i < n and r == -1; i ++) {
		if(a[5][i] == '#') continue;
		if(i - 1 >= 0 and a[5][i - 1] == '#') r = i;
		if(i + 1 <  n and a[5][i + 1] == '#') r = i;
	}
	a[2][l] = a[4][r] = '#';
	if(l > r) swap(l, r);
	if(l == r or l + 1 == r ){
		a[3][l] = '#';
	} else {
		for(int i = l + 1; i < r ; i ++) a[3][i] = '#';
	}
	for(int i = 0; i < 7; i ++)
		cout << a[i] << "\n";
	return;	 
}

signed main() {
	ios::sync_with_stdio(false), cin.tie(nullptr);
	
	int T;
	cin >> T;
	while(T --)
		solve();

	return 0;
}