# FLAT

### Syntax

**FLAT(lists, \[keys])**

| Argument name                                | Description                                             |
| -------------------------------------------- | ------------------------------------------------------- |
| <p><strong>lists</strong></p><p>Required</p> | Dictionary of lists.                                    |
| <p><strong>keys</strong></p><p>Optional</p>  | Lists to flat. By default, all lists will be flattened. |