T = int(input())
for t in range(T):
    n = int(input())
    r = list(map(int, input().split()))
    c = list(map(int, input().split()))
    ans = [[r[_]] * n for _ in range(n)]
    if n == 1:
        print(1)
        continue
    if n == 2:
        print(-1)
        continue
    if c == [c[0]] * n:
        if n <= 4:
            print(-1)
            continue
        if r[0] != c[0]:
            ans[0][0] = c[0]
            j = 0
        else:
            ans[1][0] = c[0]
            j = 1
        for i in range(1, n):
            if r[j] == c[0]:
                j += 1
            ans[j][i] = c[0]
            j += 1
        for i in ans:
            print(*i)
        continue
    f = [-1] * n
    f2 = [-1] * n
    for i in range(n - 1):
        for j in range(n):
            if f[j] < 0 and r[j] != c[i]:
                f[j] = i
                f2[i] = j
                ans[j][i] = c[i]
                break
    for i in range(n):
        if f[i] < 0:
            break
    if r[i] != c[-1]:
        ans[i][-1] = c[-1]
    else:
        for j in range(n):
            if c[j] != c[-1]:
                break
        ans[f2[j]][j] = r[f2[j]]
        ans[i][j] = c[j]
        ans[f2[j]][-1] = c[-1]
    for i in ans:
        print(*i)