#include "worldmap.h"
#include <bits/stdc++.h>
using namespace std;
void dfs(int st, vector<int>g[], int p, bool vis[], int &ind, vector<vector<int>>&ans){
    //first handle this node
    int n = ans.size();
    vis[st]=1;
    for(int i = 0;i<n;i++){
        ans[ind][i]=st;
    }
    ind++;
    for(int i = 0;i<n;i++){
        ans[ind][i]=st;
    }
    ind++;
    for(int i = 0;i<n;i++){
        ans[ind][i]=st;
    }
    ind++;
    int temp = 0;
    for(int i : g[st]){
        ans[ind-2][temp]=i;
        temp+=2;
    }
    for(int i : g[st]){
        if(vis[i]){
            continue;
        }
        dfs(i,g,st,vis,ind,ans);
    }
    if(p!=-1){
        for(int i = 0;i<n;i++){
            ans[ind][i]=p;
        }
        ind++;
    }
}
vector<vector<int>> create_map(int n, int m, vector<int> A, vector<int> B) {
    vector<int>g[n];
    for(int i = 0;i<m;i++){
        A[i]--;
        B[i]--;
        g[A[i]].push_back(B[i]);
        g[B[i]].push_back(A[i]);
    }
    vector<vector<int>>ans(4*n-1,vector<int>(4*n-1,-1));
    bool vis[n];
    fill(vis,vis+n,0);
    int ind = 0;
    dfs(0,g,-1,vis,ind,ans);
    return ans;
}
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