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--- Comment #13 from 2010-08-12 16:32:15 PDT ---
Associative arrays are a set (where each item has associated one value), where
item order doesn't matter.
While arrays are an ordered sequence, each item has one or less predecessor and
one or less successor.
In both cases I often want to know if an item is present in this set or this
ordered sequence.
Walter is wrong on this.

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