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in incremental reading, a portion of text taken from a larger article and scheduled for review and processing as a separate topic (located in the knowledge tree as a child of the parenting article). In incremental learning, you can also extract portions of videos, images, sounds, etc. For example, you can extract a picture of Ghana when learning about Ghana and you already have a political map of Africa in your collection. Use Zoom if you want to retain Africa, extract Ghana, and save space by not generating a new extract