1. S.O.L.I.D
Principles
By PaulBBy Paulo Monteiroyo Monteiro

5. Liskov Substitution Principle :
The Liskov Substitution Principle says that the
object of a derived class should be able to
replace an object of the base class WITHOUT
bringing any ERRORS in the system or
modifying the behavior of the base class.

7. Ugly duck can eat ?
This is the
Ugly Duck ...

8. Ugly duck can eat ?
Ugly duck can fly ?

9. Ugly duck can eat ?
Ugly duck can fly ?
Ugly duck can quack?

11. Is a
??????

16. Remembering the Liskov
Substitution Principle is easy:
ask if an “object” can be
substituted for another “object”
before inheriting.