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single page of information stored in SuperMemo (e.g. an article, a question-answer pair, etc.). All elements kept together are called a collection. Elements may have the form of topics (articles, extracts, summaries, etc.), items (testing material), concepts (general ideas used in semantic learning), or tasks (elements representing to-do jobs). A topic presents a larger part of the learning material, e.g. an article about the greenhouse effect. Items provide specific testing questions, e.g. How thick is the cerebral cortex? In the simplest case, topics have the form of a page of text while items are formulated as questions and answers (see: Topics vs. Items). Every element is represented in the Contents window as a single leaf or branch of the knowledge tree. The content of individual elements is displayed in the element window. Read more: Items, topics, concepts, and tasks