--- partition {|item| ... }    ruby 1.7 feature

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      [10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0].partition { |i| i % 3 == 0 }
       #=> [[9, 6, 3, 0], [10, 8, 7, 5, 4, 2, 1]]

