def test_8(self): self.assertEqual(is_valid("a923b"), False)
def test_9(self): self.assertEqual(is_valid("88231"), True)
def test_6(self): self.assertEqual(is_valid("aabcd"), False)
def test_7(self): self.assertEqual(is_valid("a8887"), False)
def test_5(self): self.assertEqual(is_valid("19923"), True)
def test_4(self): self.assertEqual(is_valid("1 34 99"), False)
def test_3(self): self.assertEqual(is_valid("732 32"), False)
def test_2(self): self.assertEqual(is_valid("853a7"), False)
def test_1(self): self.assertEqual(is_valid("49001"), True)