Question: An alternate version to specification 18 (a) would be (a') below, which declares an exception rather than requiring that the list not already contain the

An alternate version to specification 18

(a) would be (a') below, which declares an exception rather than requiring that the list not already contain the element to be inserted:

(a') exception: throws Dupl i cateElem if val is already in 1 ist ensure: 1 i s t contains all of its previous values plus val Which version of specification, a or a', is better, and why?

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