Abstract {@link BidiMap} implemented using two maps.
An implementation can be written simply by implementing the {@link #createBidiMap(Map,Map,BidiMap)} method.
@see DualHashBidiMap
@see DualTreeBidiMap
@since 3.0
@version $Id: AbstractDualBidiMap.java 1494296 2013-06-18 20:54:29Z tn $
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