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- module FooModule
- def say_hello
- "Hello!"
- end
- end
- class FooClass
- include FooModule
- end
- FooClass.new.say_hello
- # Hello!
- module BarModule
- def say_hello
- "Hello from class!"
- end
- end
- class FooClass
- extend BarModule
- end
- FooClass.say_hello
- # Hello from class!
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