Collection that can have a number of copies of each object
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bag
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A group of objects that can be considered as a whole.
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collection
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Element belonging to a bag
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item
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An ordered array of items, that can be present in multiple copies
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list
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element belonging to a list
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list item
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A collection that cannot contain duplicate elements.
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set
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The link to the members of a collection
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has element
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The link to the first item of the list.
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has first item
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Given the list (I[1], I[2], .. ...... I[i+1], ... , I[n-1] and I[n].
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The link to the following item in a list.
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is followed by
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