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In page Ruby (programming language):
"Effective with Ruby 1.9.3, released 31 October 2011,[6] Ruby switched from being dual-licensed under the Ruby License and the GPL to being dual-licensed under the Ruby License and the two-clause BSD license.[7] Adoption of 1.9 was slowed by changes from 1.8 that required many popular third party gems to be rewritten.[citation needed]
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