/guava/guava/src/com/google/common/collect/Synchronized.java
if ( ( elementSet) == null) {   elementSet = typePreservingSet( delegate( ).elementSet( ) , mutex) ; }
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} } @Override public BiMap<V, K> inverse() { synchronized (mutex) { if (inverse == null) { <extra_id_0> } return inverse; } } private static final long serialVersionUID = 0; }