From the SASS link to comments :
When the first letter of the comment is !, the comment will be interpolated and always output to css output even in compressed output modes. This is useful for adding copyright notifications to generated CSS.
So, you can run your SASS file something like this:
/*! * WARNING: Don't edit this file by hand! Instead, you should be using Compass. * (More information at http://compass-style.org/) */
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