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Preprocessors are tools that make you avoid repetition and achieve more. In this article, I’ll show examples of how to use the Sass preprocessor for CSS with the Haml preprocessor. The result that you wanted is the same that if you worked directly in the process of writing HTML & CSS, but done in less time and avoiding repetition. The main ideas are summarized as the following ones. There are better ways to write.html and.css files. Go and find your favorite preprocessor and use Sass.