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instead 
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class Commander
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app=Commander.new
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 def initialize
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app.welcome
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  instance_eval(&block)
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app.launch
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 end
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app.goodbye
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 def welcome; end
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it is possible to do something like this?
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 def launch; end
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 def goodbye; end
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end
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Commander.new do
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  welcome
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  launch
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  goodbye
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end