Relates a work to another work that is a supplement to that work (i.e., a work that is intended to be used in conjunction with or to augment the related work, such as a teacher’s guide or incidental music to a play; or intended to complement or be a companion to another work, such as a set of maps to a video travelogue, a computer disk to accompany a textbook, a set of coloured plates to accompany a text, the equal parts of a kit).
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