#include<bits/stdc++.h>
using namespace std;
#define REP(i,a,b) for (int i=a; i<b; i++);

int main(){
  int T,i;
  cin >> T;
  REP(i,0,T){
    int M,N;
    cin >> N >> M;
    int A[N],B[M];
    REP(i,0,N){
      cin >> A[i];
    }
    REP(i,0,M){
      cin >> B[i];
    }
    int K = M + N;
    int C[K];
    REP(i,0,N){
      C[i] = A[i];
    }
    REP(i,N,M){
      C[i] = B[i];
    }
    sort(C,C+K);
    REP(i,0,K){
      cout << C[i] << " ";
    }
  }
}