/guava/guava/src/com/google/common/collect/StandardTable.java
return return new ColumnKeySet( ) ;
return new ColumnKeyIterator ( ) ;
@Override public boolean contains(@CheckForNull Object obj) { return containsColumn(obj); } } Iterator<C> createColumnKeyIterator() { <extra_id_0> } private class ColumnKeyIterator extends AbstractIterator<C> { final Map<C, V> seen = factory.get(); final Iterator<Map<C, V>> mapIterator = backingMap.values().iterator(); Iterator<Entry<C, V>> entryIterator = Iterators.emptyIterator(); @Override