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"Co-Owner of a Lonely Heart" is the fourth episode of the British science fiction television series Class. It was released online by BBC Three on 5 November 2016. The episode was written by series creator Patrick Ness and directed by Philippa Langdale. It forms a two-part story with the following episode, "Brave-ish Heart". The episode's title, which refers to April and Corakinus sharing the same heart, is also a reference to the song "Owner of a Lonely Heart" by Yes. It was positively met by critics, who praised its character development.