使用Java Guava库，如何使用构建器创建ImmutableSortedSet？

final ImmutableSortedSet<String> notOk = ImmutableSortedSet.naturalOrder().build();         
final ImmutableSortedSet<String> ok = new ImmutableSortedSet.Builder<String>(Ordering.natural()).build();
final ImmutableList<String> typicalGuava = ImmutableList.of(\"one\", \"two\");

ImmutableSortedSet<String> ok = ImmutableSortedSet.<String>naturalOrder().build();

ImmutableSortedSet.Builder<String> builder = ImmutableSortedSet.naturalOrder();
// ...
ImmutableSortedSet<String> ok = builder.build();

final ImmutableSortedSet<String> nowOk = ImmutableSortedSet.<String>naturalOrder().build();