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

using ui = unsigned;
using ll = long long;
using ull = unsigned long long;
using ld = long double;
#define rep(i,l,r) for(int i=(l);i<=(r);++i)
#define per(i,l,r) for(int i=(l);i>=(r);--i)
#define repn(i,n) for(int i=0;i<(n);++i)
#define sizc(x) ((int)(x).size())
#define allc(x) (x).begin(),(x).end()
#define fir first
#define sec second

constexpr int N = 1e5+5;

int n;
char s[N],t[N];
void solve(){
    cin>>n;
    rep(i,0,n+1)s[i]=t[i]=0;
    rep(i,1,n)cin>>s[i];
    rep(i,1,n)cin>>t[i];
    if(count(s+1,s+n+1,'#')==0){
        cout<<"Yes\n";
        rep(i,1,5){
            rep(j,1,n)cout<<".";
            cout<<'\n';
        }
        rep(i,1,n)cout.put(t[i]^'.'^'#');cout<<'\n';
        rep(i,1,n)cout.put(t[i]);cout<<'\n';
        return;
    }
    if(count(t+1,t+n+1,'#')==0){
        cout<<"Yes\n";
        rep(i,1,n)cout.put(s[i]);cout<<'\n';
        rep(i,1,n)cout.put(s[i]^'.'^'#');cout<<'\n';
        rep(i,1,5){
            rep(j,1,n)cout<<".";
            cout<<'\n';
        }
        return;
    }
    bool f1=count(s+1,s+n+1,'#')==n;
    bool f2=count(t+1,t+n+1,'#')==n;
    if(f1&&f2){
        cout<<"Yes\n";
        rep(_,1,7){
            rep(i,1,n)cout<<'#';
            cout<<'\n';
        }
        return;
    }
    if(f1||f2){cout<<"No\n";return;}
    cout<<"Yes\n";
    rep(i,1,n)cout.put(s[i]);cout<<'\n';
    rep(i,1,n)cout.put(s[i]^'.'^'#');cout<<'\n';
    int p,q;
    rep(i,1,n)if(s[i]=='#'&&(s[i-1]=='.'||s[i+1]=='.'))p=i;
    rep(i,1,n)if(t[i]=='#'&&(t[i-1]=='.'||t[i+1]=='.'))q=i;
    if(abs(p-q)<=1){
        rep(i,1,2){
            rep(j,1,n)cout<<(j==p?'#':'.');
            cout<<'\n';
        }
        rep(j,1,n)cout<<(j==q?'#':'.');
        cout<<'\n';
    }
    else{
        rep(j,1,n)cout<<(j==p?'#':'.');
        cout<<'\n';
        int pp=min(p,q),qq=max(p,q);
        rep(j,1,n)cout<<(pp<j&&j<qq?'#':'.');
        cout<<'\n';
        rep(j,1,n)cout<<(j==q?'#':'.');
        cout<<'\n';
    }
    rep(i,1,n)cout.put(t[i]^'.'^'#');cout<<'\n';
    rep(i,1,n)cout.put(t[i]);cout<<'\n';
}

signed main(){
	// freopen(".in","r",stdin);
	// freopen(".out","w",stdout);
	ios::sync_with_stdio(false);
	cin.tie(nullptr);

    int T;cin>>T;
    while(T--)solve();
}