code: def examples(self):
          
          hello_str = 'hello'[:self.length]
          hello_str += ' ' * (self.length - len(hello_str))
          world_str = 'world'[:self.length]
          world_str += ' ' * (self.length - len(world_str))
          return [('hello', hello_str), ('world', world_str)]
docs: Return example strings 'hello', 'world' (size adapted).