Method subMap

corpus/java/training/guava/collect/Maps.java:912–915

(K fromKey, K toKey)

    }

    @Override
    public SortedMap<K, V> subMap(K fromKey, K toKey) {
      return asMap(backingSet().subSet(fromKey, toKey), function);
    }

    @Override
    public SortedMap<K, V> headMap(K toKey) {