#include <bits/stdc++.h>
using namespace std;
int main()
{
    int t;
    cin >> t;
    while (t--)
    {
        int n;

        string s1,s2;
        cin>>n>>s1>>s2;
       if(s1==s2){
        cout<<"YES"<<endl;
        continue;
       }
       if(n==1){
        cout<<"NO"<<endl;
        continue;
       }
       bool y=false;
       for(int i=1;i<n;i++){
        if(s1[i]==s1[i-1]||s2[i]==s2[i-1]){
            y=true;
            break;
        }
       }
       if(y)cout<<"YES"<<endl;
       else cout<<"NO"<<endl;
        
    }
}