binary tree :cactus: :) In the rest of the docs, we use a more simple approach for file structures,let's use that to be consistent:

````
libs/
    ClassLoader/
        Psr4ClassLoader.php
        ...
    Yaml/
        Yaml.php
        ...
config.yml
test.php
````

Also note that you should use 3 dots (`...`) instead of the ellipsis character (`…`)