/guava/android/guava/src/com/google/common/collect/Synchronized.java
if ( ( elementSet) == null) {   elementSet = typePreservingSet( delegate( ).elementSet( ) , mutex) ; }
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} } @Override public Set<E> elementSet() { synchronized (mutex) { if (elementSet == null) { <extra_id_0> } return elementSet; } } @Override public Set<Multiset.Entry<E>> entrySet() {