Chapter 2. Objects, methods, and local variables
Chapter 4. Modules and program organization
Figure 4.1. An instance of class D looks for method x in its method search path.
Chapter 5. The default object (self), scope, and visibility
Chapter 13. Object individuation
Figure 13.1. Method-search order, revised to include singleton classes
Figure 13.2. Relationships among classes in an inheritance relationship and their singleton classes
Chapter 14. Callable and runnable objects
Figure 14.1. A phantom Proc instantiation intervenes between a method call and a method.
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