/guava/android/guava/src/com/google/common/collect/ImmutableSortedMap.java
keySet.asList( ) , valueList.subList( fromIndex, toIndex) ) ;
keySet.getSubSet ( fromIndex, toIndex ) , valueList.subList ( fromIndex, toIndex ) ) ;
if (fromIndex == 0 && toIndex == size()) { return this; } else if (fromIndex == toIndex) { return emptyMap(comparator()); } else { return new ImmutableSortedMap<>( <extra_id_0> } } @Override public ImmutableSortedMap<K, V> headMap(K toKey) { return headMap(toKey, false); }