Changes to one map will be visible in the other and vice versa. This enables both directions of the map to be accessed equally.
Implementations should seek to avoid creating a new object every time this method is called. See AbstractMap.values() etc. Calling this method on the inverse map should return the original.
Implementations must return a SortedBidiMap instance, usually by forwarding to inverseSortedBidiMap().
@return an inverted bidirectional map
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