#include<bits/stdc++.h>
#define int long long
using namespace std;
const int N=1e6+7,inf=1e18,mod=998244353;
vector<string> s(7);
int n;
int work(int a,int b,int c)
{
	for(int i=0; i<n; i++)
	{
		if(s[a][i]=='#')
			s[b][i]='.';
		else
			s[b][i]='#';
	}
	for(int i=0; i<n-1; i++)
	{
		if(s[b][i]=='#'&&s[b][i+1]=='.')
		{
			s[c][i+1]='#';
			return i+1;
		}
		if(s[b][i]=='.'&&s[b][i+1]=='#')
		{
			s[c][i]='#';
			return i;
		}
	}
	assert(0);
}
void O_o()
{
	cin>>n;
	for(int i=0; i<=6; i++)
		s[i]="";
	cin>>s[0]>>s[6];
	int p=0,q=0;
	for(int i=0; i<n; i++)
	{
		p+=(s[0][i]=='#');
		q+=(s[6][i]=='#');
		for(int j=1; j<=5; j++)
			s[j]+='.';
	}
	if(p==n||q==n)
	{
		if(p==n&&q==n)
		{
			cout<<"Yes\n";
			for(int i=0; i<7; i++)
			{
				for(int j=0; j<n; j++)
					cout<<"#";
				cout<<"\n";
			}
			return;
		}
		else
		{
			cout<<"No\n";
			return;
		}
	}
	int x=work(0,1,2),y=work(6,5,4);
	if(x>y) swap(x,y);
	if(x+1>=y)
		s[3][x]='#';
	else
	{
		for(int i=x+1; i<y; i++)
			s[3][i]='#';
	}
	cout<<"Yes\n";
	for(int i=0; i<7; i++)
	{
		cout<<s[i]<<"\n";
	}
}
signed main()
{
	ios::sync_with_stdio(false); cin.tie(0); cout.tie(0);
	cout<<fixed<<setprecision(12);
	int T=1;
	cin>>T;
	while(T--)
	{
		O_o();
	}
}

/*
4
4
#..#
.##.
5
##.#.
.#.##
6
######
.####.
27
.######.######.####.#.#####
.####...####..#.......#####
*/