RefCell<T> and the Interior Mutability Pattern

# Introduction Welcome to **RefCell<T> and the Interior Mutability Pattern**. This lab is a part of the [Rust Book](https://doc.rust-lang.org/book/). You can practice your Rust skills in LabEx. In this lab, we will explore the concept of interior mutability in Rust and how it is implemented using the `RefCell<T>` type.

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