/guava/android/guava/src/com/google/common/collect/Sets.java
return Integer.numberOfTrailingZeros( mask) ;
return Integer.bitCount ( mask ) ;
return elements.get(index); } }; } @Override public int size() { <extra_id_0> } @Override public boolean contains(@CheckForNull Object o) { Integer index = inputSet.get(o); return index != null && (mask & (1 << index)) != 0; }