C

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

#define ll long long
#define nl "\n"

void files(){
    ios_base::sync_with_stdio(false),cin.tie(NULL),cout.tie(NULL);
    #ifndef ONLINE_JUDGE
        freopen("input.txt", "r", stdin), freopen("output.txt", "w", stdout);
    #endif
}

bool pali(string s){
    string t = s;
    reverse(t.begin(), t.end());
    return s == t;
}

void solve(){
    int n; cin>>n;
    vector<string> v(n);
    for(int i=0; i<n; i++) cin>>v[i];
    for(int i=0;i<n;i++){
        for(int j=i+1;j<n;j++){
            if(pali(v[i]+v[j]) || pali(v[j]+v[i])){
                cout<<"Yes\n";
                return;
            }
        }
    }
    cout<<"No\n";
}

int main(){
    files();
    int t = 1;
    // cin>>t;
    while(t--) solve();

    return 0;
}