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The a-hole module is a devious module which breaks JavaScript that doesn't use dependency injection or isolate itself from unexpected elements that could show up through object inheritance. Since there is quite a bit in Drupal that doesn't do this installing this module causes core JavaScript to break and thus break you site.
This module reformats the recipient list of the contact forms (/admin/build/contact) adding a line break after each email, so that categories with many recipients get rendered properly.