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hash = Hash.new { |h, k| h[k] = "key #{k} was added at #{Time.now}" }
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hash[777] # => 'key 777 was added at Sun Apr 03 13:49:57 -0700 2011'
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hash[555] # => 'key 555 was added at Sun Apr 03 13:50:01 -0700 2011'
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hash[777] # => 'key 777 was added at Sun Apr 03 13:49:57 -0700 2011'
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