code: public List<TypedDependency> typedDependencies(boolean includeExtras) {
      List<TypedDependency> deps = includeExtras ? allTypedDependencies
                                                         : typedDependencies;
      correctDependencies(deps);
      return deps;
    }
docs: Returns the typed dependencies of this grammatical structure.
  <p/>
  If the boolean argument is true, the list of typed dependencies
  returned may include "extras", and does not follow a tree structure.