A_Tricky_Template.cpp

#include<bits/stdc++.h>
using namespace std;
void wushangclan(){
    int n;
    cin>>n;
    string a,b,c;
    cin>>a>>b>>c;
    for(int i=0;i<n;i++){
        if(a[i]!=c[i] && b[i]!=c[i]){
            cout<<"YES"<<endl;
            return;
        }
    }
    cout<<"NO"<<endl;
}
int main(){
    int t;
    cin>>t;
    while(t--){
        wushangclan();
    }
}