def test_true(self):
     self.assertTrue(self_descriptive(21200))
 def test_true_2(self):
     self.assertTrue(self_descriptive(3211000))
 def test_false_3(self):
     self.assertFalse(self_descriptive(51120111))
 def test_false_4(self):
     self.assertFalse(self_descriptive(11201))
 def test_false(self):
     self.assertFalse(self_descriptive(21230))
 def test_true_6(self):
     self.assertTrue(self_descriptive(6210001000))
 def test_true_5(self):
     self.assertTrue(self_descriptive(2020))
 def test_true_4(self):
     self.assertTrue(self_descriptive(1210))
 def test_true_3(self):
     self.assertTrue(self_descriptive(42101000))