#include <bits/stdc++.h>
using namespace std;
#define maxn 500
#define inf 0x3F3F3F3F
vector <int> g[maxn];
bool vis[maxn];
int n, m, a, b;
int cnt = 0;
void dfs(int x){
    vis[x] = true;
    cout << x << endl;
    cnt++;
    for(int i = 0; i < g[x].size(); i++){
        int y = g[x][i];
        if(vis[y] == false)
            dfs(y);
    }
}

void bfs(int x){
    memset(vis, false, sizeof vis);
    vis[x] = true;
    queue < int > q;
    q.push(x);
    while(!q.empty()){
        printf("%d ", q.front());
        int atual = q.front();  q.pop();
        for(int i = 0; i < g[atual].size(); i++){
            int adj = g[atual][i];
            if(!vis[adj]){
                vis[adj] = true;
                q.push(adj);
            }
        }
    }
}


int main()
{
    int t, inicial;
    cin >> t;
    while(t--){
        cnt = 0;
        memset(vis, 0, sizeof vis);
        cin >> inicial;
        scanf("%d %d", &n, &m);
        for(int i = 0; i < m; i++){
            scanf("%d %d", &a, &b);
            g[a].push_back(b);
            g[b].push_back(a);
        }
        dfs(inicial);
        bfs(inicial);
        for(int i = 0; i < n; i++)g[i].clear();
    }
    return 0;
}