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#include<cstdio>
#include<algorithm>
using namespace std;
#define MAX (int)1e7
#define MAXN 805
int person[MAX][2],an[MAXN];
bool used[MAXN];
int main(){
#ifndef ONLINE_JUDGE
freopen("in.txt","r",stdin);
#endif
int n, best=0;
scanf("%d",&n);
n*=2;
for(int i=1;i<=n;i++)
for(int j=1;j<i;j++){
int x;
scanf("%d",&x);
person[x][0]=i;
person[x][1]=j;
best=max(best, x);
}
used[0]=1;
for(int i=best;i>0;i--){
if(!used[person[i][0]]&&!used[person[i][1]]){
used[person[i][0]]=1;
used[person[i][1]]=1;
an[person[i][0]]=person[i][1];
an[person[i][1]]=person[i][0];
}
}
for(int i=1;i<=n;i++){
if(i>1) printf(" ");
printf("%d",an[i]);
}
return 0;
}