With this approach, we can fully choose which components, features, and utilities will be compiled into the output CSS. It's worth noting that generally the files near the top of the list are more likely to be required by other Sass files in Bootstrap, in order to work as expected. If removing a file causes a compiler error, it's probably because it contained content that was required for a later imported component to work properly. Some trial and error may be necessary to figure out which files are dependent on each other, but, generally, components and utility classes are optional and can be safely removed from Bootstrap.