#include<bits/stdc++.h>
using namespace std;
const int N=100010;
char str1[N],str2[N],str3[N],str4[N],str5[N],str6[N],str7[N];
int main()
{
    int T;
    scanf("%d",&T);
    while(T--)
    {
        int n;
        scanf("%d",&n);
        getchar();
        scanf("%s",str1);
        getchar();
        scanf("%s",str7);
        int cnt_up_dot=0;
        int cnt_down_dot=0;
        for(int i=0;i<n;i++)
        {
            if(str1[i]=='#')str2[i]='.';
            else 
            {
                cnt_up_dot++;
                str2[i]='#';
            }
            if(str7[i]=='#')str6[i]='.';
            else
            {
                cnt_down_dot++;
                str6[i]='#';
            }
        }
        int curr_up=114514;
        int curr_down=114514;
        for(int i=0;i+1<n;i++)
        {
            if(str2[i]=='.'&&str2[i+1]=='#'&&curr_up==114514)
            {
                curr_up=i;
            }
            else if(str2[i]=='#'&&str2[i+1]=='.'&&curr_up==114514)
            {
                curr_up=i+1;
            }

            if(str6[i]=='.'&&str6[i+1]=='#'&&curr_down==114514)
            {
                curr_down=i;
            }
            else if(str6[i]=='#'&&str6[i+1]=='.'&&curr_down==114514)
            {
                curr_down=i+1;
            }
        }
        for(int i=0;i<n;i++)
        {
            if(i==curr_up)str3[i]='#';
            else str3[i]='.';

            if(i==curr_down)str5[i]='#';
            else str5[i]='.';
        }
        if(fabs(curr_up-curr_down)<=1)
        {
            for(int i=0;i<n;i++)
            {
                if(i==curr_down)str4[i]='#';
                else str4[i]='.';
            }
        }
        else 
        {
            for(int i=0;i<n;i++)
            {
                if((min(curr_up,curr_down)<i)&&(i<max(curr_up,curr_down)))str4[i]='#';
                else str4[i]='.';
            }
        }
        if(cnt_down_dot==0 && cnt_up_dot==0)
        {
            printf("Yes\n");
            for(int i=1;i<=7;i++)
            {
                for(int j=1;j<=n;j++)
                {
                    printf("#");
                }
                printf("\n");
            }
        }
        else if(cnt_down_dot==0 || cnt_up_dot==0)
        {
            printf("No\n");
        }
        else
        {
            printf("Yes\n");
            for(int i=0;i<n;i++)printf("%c",str1[i]);
            printf("\n");
            for(int i=0;i<n;i++)printf("%c",str2[i]);
            printf("\n");
            for(int i=0;i<n;i++)printf("%c",str3[i]);
            printf("\n");
            for(int i=0;i<n;i++)printf("%c",str4[i]);
            printf("\n");
            for(int i=0;i<n;i++)printf("%c",str5[i]);
            printf("\n");
            for(int i=0;i<n;i++)printf("%c",str6[i]);
            printf("\n");
            for(int i=0;i<n;i++)printf("%c",str7[i]);
            printf("\n");
        }
    }
    return 0;
}