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#include <iostream>
#include <vector>
#include <string>
#include <queue>
#include <stack>
using namespace std;
bool print_path(int [][26], int start, int dest, string &path, bool visited[]);
int main(){
int tc;
cin>>tc;
while(tc--){
int r, q, c1, c2;
char city1[100], city2[100];
int map[26][26] = {0};
cin>>r>>q;
while(r--){
cin>>city1>>city2;
c1 = (int)city1[0] % 65;
c2 = (int)city2[0] % 65;
map[c1][c2] = 1;
map[c2][c1] = 1;
}
while(q--){
string path=""; int i=0;bool viz[26];
cin>>city1>>city2;
c1 = (int)city1[0] % 65;
c2 = (int)city2[0] % 65;
print_path(map, c1, c2, path, viz);
cout<<path<<endl;
}
}
}
bool print_path(int map[26][26], int start, int dest, string &path, bool visited[]){
if(start==dest){
path+=char(start+65);
return true;
}
else{
visited[start]=true;
for(int j=0; j<26; j++){
if(map[start][j]==1 && visited[j]==false){
visited[j]=true;
if(print_path(map, j, dest, path, visited) == true){
path+=char(start+65);
return true;
}
}
}
return false;
}
}
/*
FIND(dest, node)
if node == dest:
path+=node
return true
else
for node in unvisited(node.pi)
visited[node]=true
if(FIND(dest, node))
path+=node
*/
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