#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair<int, int> pii;
#define fi first
#define se second
#define mp make_pair
#define fastIO ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);
const int N = 505;
int cnt[N];
bool ban[N];
bool use[N];
int main(){
fastIO;
int n, m;
cin >> n >> m;
for(int i = 0 ; i < n; i ++ ){
for(int j = 0 ; j < n; j ++){
if((i & (m + j)) == i) cnt[i] ++ ;
}
}
int low;
for(int sol = 0; sol < n ; sol ++ ){
low = -1;
for(int i = 0 ; i < n ; i ++ ){
if(ban[i]) continue;
if(low == -1 || cnt[i] < cnt[low]){
low = i;
}
}
if(cnt[low] == 0){
assert(0);
return 0;
}
for(int j = 0 ; j < n; j ++ ){
if(use[j]) continue;
if((low & (m + j)) == low){
cout << low << " " << m + j << "\n";
use[j]=true;
ban[low]=true;
for(int x = 0; x < n; x ++ ){
if((x & (m + j)) == x)
cnt[x]--;
}
break;
}
}
}
return 0;
}
