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To create a variable in the code, you can simply declare it in your script. The way you do this depends on the programming language you're using. Here are examples in some common languages:

- Python:
```
my_variable = "Hello, world!"
```

- JavaScript:
```javascript
let myVariable = "Hello, world!";
```

- Java:
```java
String myVariable = "Hello, world!";
```

If you're asking about a specific context or language, could you please provide more details?

i'm talking about these variables: Variables<https://docs.prefect.io/2.14.3/guides/variables/?h=var#variables|¶>
Variables enable you to store and reuse non-sensitive bits of data, such as configuration information. Variables are named, mutable string values, much like environment variables. Variables are scoped to a Prefect server instance or a single workspace in Prefect Cloud.