#include <iostream>
using namespace std;

int main() {
	// your code goes here
	int n ; cin>>n ;
	int arr[n];
	for(int i =0;i<n;i++){
		cin>>arr[i];
	}
	for(int i =0;i<n-1;i++){
		for(int j =i+1;j<n;j++){
			cout<<"("<<arr[i]<<","<<arr[j]<<") ";
		}
		cout<<endl;
	}
	
	return 0;
}