棋子移动

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