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The symbol "=>" used in program examples should be read
"evaluates to." For example,
(* 5 8) ==> 40
means that the expression (* 5 8) evaluates to the object 40. Or, more precisely: the expression given by the sequence of characters "(* 5 8)" evaluates, in the initial environment, to an object that may be represented externally by the sequence of characters "40". See section External representations for a discussion of external representations of objects.