#include <stdio.h>
#include <stdlib.h>

typedef struct Node {
	int data;
	struct Node *next;
} Node, *LinkList;

void MergeList(LinkList a, LinkList b);

int main() {
	int T = 0;
	int t = 0;
	scanf("%d", &T);
	for( t = 0; t < T; t++ ) { // Loop for T times 
		int lenA = 0, lenB = 0;
		int i = 0;
		scanf("%d", &lenA);
		scanf("%d", &lenB);
		
		//Create La
		LinkList La;
		La = (LinkList)malloc(sizeof(Node));
		La->next = NULL;
		for ( i = 0; i < lenA; i++ ) {
			Node* p = NULL;
			p = (LinkList)malloc(sizeof(Node));	
			p->next = La->next;
			La->next = p;		
		}
		//Create Lb
		LinkList Lb;
		Lb = (LinkList)malloc(sizeof(Node));
		Lb->next = NULL;
		for ( i = 0; i < lenB; i++ ) {
			Node* p = NULL;
			p = (LinkList)malloc(sizeof(Node));	
			p->next = Lb->next;
			Lb->next = p;		
		}
		
		//Input La
		LinkList ptrA = La;
		for ( i = 0; i < lenA; i++) {
			ptrA = ptrA->next;
			scanf("%d", &(ptrA->data));
		}
		
		//Input Lb
		LinkList ptrB = Lb;
		for ( i = 0; i < lenB; i++) {
			ptrB = ptrB->next;
			scanf("%d", &(ptrB->data));
		}
		
		//Merge Lb to La
		MergeList(La, Lb);
		
		//Generate Lc 
		LinkList Lc = La;
		
		//Print Lc 
		LinkList p = Lc->next;
		for ( i = 0; i < (lenA + lenB); i++ ) {
			printf("%d",p->data);
			p = p->next;
			if ( i == lenA + lenB - 1 ) {
				printf ("\n");
			}
			else printf(" ");
		}
	}
	return 0;
}

void MergeList(LinkList a, LinkList b) {
	LinkList NewP, pa, pb; 
	NewP = a;//Travel through new list
	pa = a->next;// Travel through La
    pb = b->next;// Travel through Lb
    while (pa && pb)
    {
    	//Add a node from La 
    	NewP->next = pa;
    	pa = pa->next;
    	NewP = NewP->next; 
    	if (pa==0) break;//stop, if La is empty
    	//Add a node from Lb
    	NewP->next = pb;
    	pb = pb->next;
    	NewP = NewP->next;
    	if (pb==0) break;//stop, if Lb is empty 
    }
    NewP->next = pa ? pa : pb;//Append the rest 
    free(b);    //Free the header of Lb
    return; 
}