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"Simula 67 introduced objects,[1]: 2, 5.3 classes,[1]: 1.3.3, 2 inheritance and subclasses,[1]: 2.2.1 virtual procedures,[1]: 2.2.3 coroutines,[1]: 9.2 and discrete event simulation,[1]: 14.2 and featured garbage collection.[1]: 9.1 Other forms of subtyping (besides inheriting subclasses) were introduced in Simula derivatives.[citation needed]
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