import java.io.*;
public class Main{
  public static void main(String args[])throws IOException
  {
   BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
    int n=Integer.parseInt(br.readLine());
    int i,c=0,flag=0;
    String s="";
    for(i=0;i<n;i++)
    {
      s=br.readLine();
      if(s.charAt(0)==(s.charAt(2))){
        c++;
        if(c>2){
        flag=1;
        break;}
      }
      else
        c=0;
      
    }
    if(flag==1)
      System.out.println("Yes");
    else
      System.out.println("No");
  }
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz