Explain the Liskov Substitution Principle.
The Liskov Substitution Principle is a design guideline stating that if S is a subtype of T, then objects of type T may be replaced with objects of type S without altering any of the desirable properties of the program. Essentially, a subclass should be substitutable for its superclass without breaking the program's logic. This promotes extensibility and reduces the likelihood of introducing errors when extending a system.
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