#include<bits/stdc++.h>
using namespace std;
int n;
string xing[1005],ming[1005];
int main()
{
	cin>>n;
	for(int i=1;i<=n;i++)
	{
		cin>>xing[i]>>ming[i];
	}
	for(int i=1;i<=n-1;i++)
	{
		if(xing[i]==xing[i+1]&&ming[i]==ming[i+1])
		{
			cout<<"Yes"<<endl;
			return 0;
		}
	}
	if(xing[1]==xing[n]&&ming[1]==ming[n])
	{
		cout<<"Yes"<<endl;
		return 0;
	}
	cout<<"No"<<endl;
}