#include <bits/stdc++.h>
using namespace std;
int main() {
int arr[]={1, 2, 3, 4, 1, 2, 3, 4};
int n=sizeof(arr)/sizeof(arr[0]);
int k=3;
bool flag=false;
for(int i=0;i<n-k;i++){
for(int j=i+1;j<=i+k;j++){
if(arr[i]==arr[j])
{
cout<<"yes";
flag=true;
break;
}
}
}
if(flag==false)
cout<<"no";
return 0;
}
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