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Elementary event

In probability theory, an elementary event or atomic event is a subset of a sample space that contains only one member of the sample space. Any discrete probability distribution is determined by the probabilities it assigns to what may be called elementary events or atomic events.

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Functional programming

... the example above: z = f(getchar(), getchar()); we cannot eliminate getchar() as we did for sqrt(2), because in C, "getchar()" might return two different values ...