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Guava introduces many advanced collections based on developers’ experience in application development works. Given below is a list of useful collections −

Sr.No	Collection name & Description
1	Multiset An extension to Set interface to allow duplicate elements.
2	Multimap An extension to Map interface so that its keys can be mapped to multiple values at a time.
3	BiMap An extension to Map interface to support inverse operations.
4	Table Table represents a special map where two keys can be specified in combined fashion to refer to a single value.

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