棋子移动

/*
#include <iostream>
using namespace std;
void a(int n){
	cout<<n;
	
}
int main(){
	
	int N;
	cin>>N;
	a(N);
	
	
	
	
	
	
	
	system("pause");
	return 0;
}
*/
#include <iostream>
using namespace std;
int a(int n){
	if(n==4){
		cout<<"4,5-->9,10"<<endl;
		cout<<"8,9-->4,5"<<endl;
		cout<<"2,3-->8,9"<<endl;
		cout<<"7,8-->2,3"<<endl;
		cout<<"1,2-->7,8"<<endl;
	}else{
		cout<<n<<","<<n+1<<"-->"<<2*n<<","<<2*n+1<<endl;
		cout<<2*n-1<<","<<2*n<<"-->"<<n<<","<<n+1<<endl;
		a(n-1);
	}
	
}
int main(){
	int N;
	cin>>N;
	a(N);
	system("pause");
	return 0;
}