#include<bits/stdc++.h>
using namespace std;
#define i64 long long
inline i64 rd()
{
	i64 num=0;char ch=getchar();bool op=0;
	for(;!isdigit(ch);ch=getchar())if(ch=='-')op=1;
	for(;isdigit(ch);ch=getchar())num=num*10+(ch-'0');
	return op?-num:num;
}
const int N=1e5+10;
int n;
inline bool isAll(char *a,char ch)
{
	for(int i=0;i< n;i++)if(a[i]!=ch)return 0;
	return 1;
}
char a[7][N];
inline void print(){printf("Yes\n");for(int i=0;i<=6;i++)a[i][n]=0,printf("%s\n",a[i]);}
inline void work()
{
	n=rd(),scanf("%s%s",a[0],a[6]);
	int type=isAll(a[0],'#')+isAll(a[6],'#');
	for(int i=1;i<=5;i++)for(int j=0;j< n;j++)a[i][j]=".#"[type==2];
	if(type==2)return print();
	if(type==1)return printf("No\n"),void();
	
	int L1=-1,L5=-1;
	for(int i=n-1;i>=1;i--)if(a[0][i]=='.')a[1][i]='#',L1=i;
	for(int i=n-1;i>=1;i--)if(a[6][i]=='.')a[5][i]='#',L5=i;
	if(L1==-1)a[1][0]='#',L1=1;
	if(L5==-1)a[5][0]='#',L5=1;
	a[2][--L1]='#',a[4][--L5]='#';
	if(abs(L1-L5)<=1)a[3][L1]='#';
	else
	{
		if(L1>L5)swap(L1,L5);
		for(int i=L1+1;i<L5;i++)a[3][i]='#';
	}
	print();
}

int main()
{
	for(int test=rd();test;test--)work();
	return 0;
}