text: """
  * Assignment: OOP InheritancePatterns Mixin
  * Complexity: easy
  * Lines of code: 8 lines
  * Time: 3 min
  
  English:
      1. Create class `MarsMission` from classes `Habitat`, `Rocket`, `Astronaut`
      2. Use mixins classes
      3. You can modify given classes
      4. Assignment demonstrates syntax, so do not add any attributes and methods
      5. Run doctests - all must succeed
  
  Polish:
      1. Stwórz klasę `MarsMission` z klas `Habitat`, `Rocket`, `Astronaut`
      2. Użyj klas domieszkowych (mixin)
      3. Możesz modyfikować dane klasy
      4. Zadanie demonstruje składnię, nie dodawaj żadnych atrybutów i metod
      5. Uruchom doctesty - wszystkie muszą się powieść
  
  Tests:
      >>> import sys; sys.tracebacklimit = 0
      >>> from inspect import isclass
  
      >>> assert isclass(Habitat)
      >>> assert isclass(Astronaut)
      >>> assert isclass(Rocket)
      >>> assert isclass(MarsMission)
      >>> assert issubclass(MarsMission, Habitat)
      >>> assert issubclass(MarsMission, Astronaut)
      >>> assert issubclass(MarsMission, Rocket)
  
      >>> assert len(Habitat.__subclasses__()) == 1
      >>> assert len(Astronaut.__subclasses__()) == 1
      >>> assert len(Rocket.__subclasses__()) == 1
      >>> assert len(MarsMission.__subclasses__()) == 0
  """
  