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 # Variables
 In Rust, variables are immutable by default.
 When a variable is immutable, once a value is bound to a name, you can’t change that value.
 You can make them mutable by adding mut in front of the variable name.
 ## Further information
 - [Variables and Mutability](https://doc.rust-lang.org/book/ch03-01-variables-and-mutability.html)