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Chapter 10. The Ruby Environment > The Top-Level Environment
10.2. The Top-Level Environment
When the Ruby interpreter starts, a number of classes, modules, constants, and global variables and global functions are defined and available for use by programs. The subsections that follow list these predefined features.
10.2.1. Predefined Modules and Classes
When the Ruby 1.8 interpreter starts, the following modules are defined:
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