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| beans = [:arabica, :robusta] | |
| beans.select { |type| type == :arabica } | |
| beans.flatten! | |
| beans.compact! | |
| espresso = beans.inject(:steam) {} | |
| frapuccino = ([[:milk]] << [espresso]).freeze | |
| frapuccino.take_while { |cup| cup.any? } |
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