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PlantUML source code.

@startuml
abstract class Pet
{
    +{abstract} Speak()
}

class Cat extends Pet
{
    +Speak()
}

class Dog extends Pet
{
    +Speak()
}

note left of Cat::Speak()
  Cat says meow!
end note

note right of Dog::Speak()
  Dog says woof!
end note
@enduml