code: public EntityMakerBuilder reuseEntities(Collection<Object> entities) {
          for (Object entity : entities) {
              Class aClass = entity.getClass();
              valueHolder.putIfNotNull(aClass, entity);
          }
          return this;
      }
docs: Reuse a collection of objects when making new entities.
  
  @param entities
  reusable collection of entities
  @return this