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Bidirectional map

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Title: Bidirectional map  
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Subject: List of data structures
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Bidirectional map

In computer science, a bidirectional map is an associative data structure in which the (key, value) pairs form a one-to-one correspondence. Thus the binary relation is functional in each direction: value can also act as a key to key. A pair (a, b) thus provides a unique coupling between a and b so that b can be found when a is used as a key and a can be found when b is used as a key.

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