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This page	Is the same as	Supports	Conflicts with
A class should not depend on its users	Dependency inversion principle
Acyclic dependencies principle
Avoid becomes		State
Avoid downcasting		Tell, don't ask
Avoid equals		Immutable object
Avoid concrete base classes		Avoid inheritance for implementation	Heuristic 3.7 Eliminate irrelevant classes
Avoid no-op overrides		Liskov substitution principle, Design by contract
Avoid side effects		Command query separation, Immutable object
Behavioral completeness	Define classes by behavior, not state pattern, Model the real world	Single responsibility principle, Separation of concerns
Beware singletons
Beware type switches heuristic 5.12	Switch statements smell	Strategy
bob
bob