/guava/android/guava/src/com/google/common/collect/Sets.java
if ( !set2.contains( e) ) { return set2.containsAll( set1) ; }
return set2.containsAll ( set1 ) ;
} } return size; } @Override public boolean isEmpty() { <extra_id_0> } @Override public boolean contains(@CheckForNull Object element) { return set1.contains(element) && !set2.contains(element); } };