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

/*
 * @author abhishek
 *
*/

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);

    int tt;
    cin>>tt;
    while(tt--) {
        int n;
        cin>>n;
        string s, p;
        cin>>s>>p;

        if(s==p) {
            cout<<"YES"<<endl;
            continue;
        }
        if(n==1) {
            cout<<"NO"<<endl;
            continue;
        }
        set<string>visited;
        queue<string>q;
        q.push(s);
        visited.insert(s);


        bool f= false;
        while(!q.empty()) {
            string curr= q.front();
            q.pop();

            for(int i=0;i<n-1;i++) {
                for(string s1:{"01", "10"}) {
                    string next= curr;
                    next[i]= s1[0];
                    next[i+1]= s1[1];

                    if(!visited.count(next)) {
                        if(next==p) {
                            f= true;
                            break;
                        }
                        visited.insert(next);
                        q.push(next);
                    }
                }
                if(f) {
                    break;
                }
            }
            if(f) {
                break;
            }
        }
        if(f) {
            cout<<"YES"<<endl;
        } else{
            cout<<"NO"<<endl;
        }

    }
    return 0;
}