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module で module を include できますよ。
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----
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```ruby
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module Doubutsu
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def nake
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"では鳴きます #{say}"
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end
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end
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module Piyo
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include Doubutsu
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def say
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'piyo-piyo'
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end
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end
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module BowWow
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include Doubutsu
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def say
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'bow-wow'
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end
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end
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class Tori
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include Piyo
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end
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class Inu
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include BowWow
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end
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Tori.new.nake # => "では鳴きます piyo-piyo"
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Inu.new.nake # => "では鳴きます bow-wow"
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```
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