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ftp://ftp.ruby-lang.org/pub/ruby/2.0/ruby-2.0.0-p0.zip
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Ruby 2.0初のプレビュー版がリリース! 注目機能は!?:Rails Hub情報局:エンジニアライフ
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special thanks
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http://bugs.ruby-lang.org/projects/ruby/wiki/200SpecialThanks
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