import sys
input = sys.stdin.readline

from random import randint
from collections import Counter

def check(A,R,C):
    for i in range(len(A)):
        CO=Counter(A[i])
        xx=CO[R[i]]

        for c in CO:
            if c==R[i]:
                continue
            if CO[c]>=xx:
                return False

    return True
        
    

T=int(input())

for tests in range(T):
    N=int(input())
    R=list(map(int,input().split()))
    C=list(map(int,input().split()))

    if N==1:
        print(-1)
        continue

    D={R[i]:i for i in range(N)}

    flag=0

    for kk in range(1000):

        ANS=[[-1]*N for i in range(N)]

        for i in range(N):
            ANS[i]=[R[i]]*N

        for j in range(N):
            while True:
                xx=randint(0,N-1)

                if xx==D[C[j]]:
                    continue
                else:
                    break

            ANS[xx][j]=C[j]

        if check(ANS,R,C)==True:
            flag=1
            break

        flag=0

    if flag==1:
        for ans in ANS:
            print(*ans)
    else:
        print(-1)