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# Variables - Assignment and Scope

#### Topics in this section

- Variables - Assignment and Scope
- Variable Assignment
- Scope of Variables
- Specifying Global Variables As Global Using ::
- Persistent Global Variables
- Type-Free Variables
- Reference Assignment
- Global and Persistent Global Variable Methods
- Memory Allocation and Garbage Collection
- Definition Constructs Can Include Global Variable Declarations At Top Level
- Changes to Undeclared Implicit Global Variables