def solution(*args):
    for s1, s2 in zip(args, args[1:]):
        a, b, l = (s1, s2, len(s2)) if len(s1) > len(s2) else (s2, s1, len(s1))
        if l and (a[-l:] != b or a[:l] != b):
            return False
    return True

print(solution("", "aab"))
print(solution("ab", "abab"))
print(solution("abc", "abcd", "abcabc"))