#include <iostream>
#include <algorithm>
#include <string>
#include <vector>
#include <cstring>
using namespace std;
int main(){
int a;
cin >> a;
int res = 0;
vector<string> p(a + 10);
for(int i = 0; i < a; i ++){
string k;
cin >> k;
p[i] = k;
}
for(int i = 0; i < a; i ++){
for(int j = 0; j < a; j ++){
if(i == j) continue;
string h = p[i] + p[j];
string l = h;
reverse(h.begin(),h.end());
if(h == l) res = 1;
}
}
if(res == 1) cout << "Yes" << endl;
else cout << "No" << endl;
return 0;
}
主要是了解reverse这一知识点