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