#include<bits/stdc++.h>
using namespace std;
void solve()
{
	int n;
	cin >> n;
	getchar();
	vector<vector<char>>ch(7, vector<char>(n + 2));
	for (int i = 0; i < n; i++)ch[0][i] = getchar();
	getchar();
	for (int i = 0; i < n; i++)ch[6][i] = getchar();
	bool fla1 = 1, fla2 = 1;
	for (int i = 0; i < n; i++)
	{
		if (ch[0][i] == '.')ch[1][i] = '#', fla1 = 0;
		else ch[1][i] = '.';
		if (ch[6][i] == '.')ch[5][i] = '#', fla2 = 0;
		else ch[5][i] = '.';
	}
	if (fla1 && fla2)
	{
		printf("Yes\n");
		for(int j=0;j<7;j++)
		{
			for (int i = 0; i < n; i++)
				putchar('#');
			putchar('\n');
		}
		return;
	}
	if ((!fla1) && fla2 || (!fla2) && fla1)
	{
		printf("No\n");
		return;
	}
	int pla1, pla2;
	for (int i = 0; i < n; i++)
	{
		if (ch[1][i] == '.' && (i<n-1&&ch[1][i + 1] == '#' || (i > 0 && ch[1][i - 1] == '#')))
		{
			pla1 = i;
			break;
		}
	}
	for (int i = 0; i < n; i++)
	{
		if (ch[5][i] == '.' && (i<n-1&&ch[5][i + 1] == '#' || (i > 0 && ch[5][i - 1] == '#')))
		{
			pla2 = i;
			break;
		}
	}
	for (int i = 0; i < n; i++)
	{
		if (i != pla1)ch[2][i] = '.';
		else ch[2][i] = '#';
		if(i != pla2)ch[4][i] = '.';
		else ch[4][i] = '#';
	}
	if (pla1 == pla2||pla1-pla2==1||pla2-pla1==1)
	{
		for (int i = 0; i < n; i++)
		{
			if (i != pla1)ch[3][i] = '.';
			else ch[3][i] = '#';
		}
	}
	else
	{
		int tmp;
		if (pla1 > pla2)tmp = pla1, pla1 = pla2, pla2 = tmp;
		for (int i = 0; i < n; i++)
		{
			if (i > pla1 && i < pla2)ch[3][i] = '#';
			else ch[3][i] = '.';
		}
	}
	printf("Yes\n");
	for (int i = 0; i < 7; i++)
	{
		for (int j = 0; j < n; j++)
			putchar(ch[i][j]);
		putchar('\n');
	}
	return;
}
int main()
{
	int t;
	cin >> t;
	while (t--)solve();
}