#include<iostream>
using namespace std;int main(){
int n=2,ab=0,cd=0;
double point1[20]={0.0,0.0,1.0,1.0,1.0,0.0,2.0,1.0};
double point2[20]={3.0,2.0,9.0,6.0,13.0,5.0,7.0,9.0};

ab = ((1.0-0.0)/(1.0-0.0));
cd = ((1.0-0.0)/(2.0-1.0)); if( ab = cd) cout << "YES\n" ;
else cout << "NO\n" ;

ab = ((6.0-2.0)/(9.0-3.0));
cd = ((9.0-5.0)/(7.0-13.0)); if( ab = cd) cout << "YES\n" ;
else cout << "NO\n" ;    return 0;
}