Hmmm... these don't contain my suggestions

```

...

// check if the file contains too many header levels

// (stripos($markdown,'###') !== false) ? throw new InvalidArgumentException('This markdown file contains too many header levels. Please correct down to 2 levels and retry.') : $markdown;

// break the file into metadata and sections

// $markdownFormatted = explode("^##\s", $markdown);

$markdownFormatted = preg_split("^##\s", $markdown); // split on all lines beginning with `##` followed by a space, indicating heading level #2

// check if the file contains too few header levels

(count($markdownFormatted) === 1) ? throw new InvalidArgumentException('This markdown file contain no headers or only one level of headers. Please add a second level and retry.') : $markdownFormatted;

$this->set_short_title(trim($this->bookArguments[1], ".md"));

// $bookTitle = array_shift($markdownFormatted);

$bookCover = explode(PHP_EOL, $markdownFormatted[0], 2);

if(count($bookCover) > 1) {

$bookTitle = $bookCover[0];

$markdownFormatted[0] = $bookCover[1];

} else {

$bookTitle = $bookCover[0];

$bookCover = "";

array_shift($markdownFormatted);

}

$this->set_title(trim(trim($bookTitle, "# ")));

...

```