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ZDD : Tutorial : Use require method to load ZDD Ruby Extension Library

2.1 Use require method to load ZDD Ruby Extension Library

ZDD Ruby Extension Library uses RubyGems package. Use the require method to load rubygems library and load the zdd library. Note that Ruby 1.9 and above includes RubyGems by default, thus it is not necessary to load gem libraries. 

> require 'rubygems' #Not required for Ruby 1.9 and above.
> require 'zdd'
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