for _ in range(int(input())):
a = int(input())
b = int(input())
c = int(input())
A = [input() for i in range(a)]
B = [input() for i in range(b)]
C = [input() for i in range(c)]
for i in A:
for j in B:
for k in C:
print(i,j,k+".")
print()