Note that a successful call to this method could cause the size of the bimap to increase by one, stay the same, or even decrease by one.
Warning: If an existing entry with this value is removed, the key for that entry is discarded and not returned. @param key the key with which the specified value is to be associated @param value the value to be associated with the specified key @return the value which was previously associated with the key, which maybe {@code null}, or {@code null} if there was no previous entry
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