S = Single Responsibility
A class should have one responsibility.

O = Open/Closed
A class should be open for extension but closed for modification.

L = Liskov Substitution
Objects in a program should be replaceable with instances of their subtypes without altering the correctness of that program.

I = Interface Segregation
Many client-specific interfaces are better than on general-purpose interface.

D = Dependency Inversion
One should depend upon abstractions rather than concrete classes.


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