The simplest way to solve this is to just return a `String` rather than a `& str`:

```rust
fn fizzbuzz(n: usize) -> String {
	match (n % 3, n % 5) {
		(0, 0) => "fizzbuzz".to_string(),
		(0, _) => "fizz".to_string(),
		(_, 0) => "buzz".to_string(),
		_ => n.to_string(),
	}
}
```
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