#include "bits/stdc++.h"
#define FAST ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL)
using namespace std;

void solve(){
    int n;
    cin>>n;
    string a,b;
    cin>>a;
    cin>>b;
    string aa = "",bb="";
    for (int i = 0; i < n; ++i)
    {
        if(a[i] != '.')
            aa+=a[i];
        if(b[i] != '.')
            bb+=b[i];
    }
    cout<<(aa == bb ? "yes\n":"no\n");
}

int main(){
    #ifndef ONLINE_JUDGE
     freopen("input.txt", "r", stdin);
     freopen("out.txt", "w",stdout);
    #endif
    FAST;

    int t = 1;
    cin>>t;
    while(t--)
        solve();    
}