#include<bits/stdc++.h>
#ifdef LOCAL
#define debug(...) printf(__VA_ARGS__)
#define edebug(...) fprintf(stderr, __VA_ARGS__)
#else
#define debug(...)
#define edebug(...)
#endif
#define int ll
#define rep(i, x, y) for(int i = x; i <= y; ++i)
#define nrep(i, x, y) for(int i = x; i >= y; --i)
#define ll long long
#define pii std::pair<int,int>
#define pb emplace_back
#define fi first
#define se second
template <class T> 
inline void ckmax(T &a, T b) {
  if(a < b) a = b;
}
template <class T> 
inline void ckmin(T &a, T b) {
  if(a > b) a = b;
}
auto rt_YES = []{puts("YES");};
auto rt_Yes = []{puts("Yes");};
auto rt_NO = []{puts("NO");};
auto rt_No = []{puts("No");};
namespace IO {
#define isdigit(x) (x >= '0' && x <= '9')
  inline char gc() {
    return getchar();
  }
  inline bool blank(char ch) {
    return ch == ' ' || ch == '\n' || ch == '\r' || ch == '\t';
  }
  template <class T>
  inline void read(T &x) {
    double tmp = 1;
    bool sign = 0;
    x = 0;
    char ch = gc();
    for(; !isdigit(ch); ch = gc())
      if(ch == '-') sign = 1;
    for(; isdigit(ch); ch = gc())
      x = x * 10 + (ch - '0');
    if(ch == '.')
      for(ch = gc(); isdigit(ch); ch = gc())
        tmp /= 10.0, x += tmp * (ch - '0');
    if(sign) x = -x;
  }
  inline void read(char *s) {
    char ch = gc();
    for(; blank(ch); ch = gc());
    for(; !blank(ch); ch = gc())
      *s++ = ch;
    *s = 0;
  }
  inline void read(char &c) {
    for(c = gc(); blank(c); c = gc());
  }
  inline void push(const char &c) {
    putchar(c);
  }
  template <class T>
  inline void print(T x) {
    if(x < 0) {
      x = -x;
      push('-');
    }
    static T sta[35];
    T top = 0;
    do {
      sta[top++] = x % 10;
      x /= 10;
    } while(x);
    while(top)
      push(sta[--top] + '0');
  }
  template <class T>
  inline void print(T x, char lastChar) {
    print(x);
    push(lastChar);
  }
}
using namespace IO;

int a[7][100020];
char s[100010],t[100010];
void solve(){
  int n;read(n);
  scanf("%s%s",s,t);
  int flags=1,flagt=1;
  rep(i,0,n-1){
    if(s[i]=='.')a[0][i]=0,flags=0;
    else a[0][i]=1;
    if(t[i]=='.')a[6][i]=0,flagt=0;
    else a[6][i]=1;
  }
  if(flags+flagt==1){rt_No();return;}
  rt_Yes();
  if(flags*flagt){
    rep(i,1,7){
      rep(j,1,n)putchar('#');
      puts("");
    }
    return;
  }
  rep(i,0,n-1)if(a[0][i]==0)a[1][i]=1;else a[1][i]=0;
  rep(i,0,n-1)if(a[6][i]==0)a[5][i]=1;else a[5][i]=0;
  rep(i,2,4)rep(j,0,n-1)a[i][j]=0;
  int pl=0,pr=0;
  rep(i,0,n-1)if(a[1][i]==0&&((i!=0&&a[1][i-1]==1)||(i!=n-1&&a[1][i+1]==1))){a[2][i]=1;pl=i;break;}
  rep(i,0,n-1)if(a[5][i]==0&&((i!=0&&a[5][i-1]==1)||(i!=n-1&&a[5][i+1]==1))){a[4][i]=1;pr=i;break;}
  if(pl==pr)a[3][pl]=1;
  else if(abs(pl-pr)==1)a[3][pl]=1;
  else{
    int l=std::min(pl,pr),r=std::max(pl,pr);
    rep(i,l+1,r-1)a[3][i]=1;
  }
  rep(i,0,6){
    rep(j,0,n-1)if(a[i][j]==1)putchar('#');else putchar('.');
    puts("");
  }
}

signed main() {
  clock_t c1 = clock();
#ifdef LOCAL
  freopen("in.in", "r", stdin);
  freopen("out.out", "w", stdout);
#endif
//------------------------------------------------------------------

  int t;read(t);while(t--)solve();

//------------------------------------------------------------------
end:
  std::cerr << "Time : " << clock() - c1 << " ms" << std::endl;
  return 0;
}