Homework 6 has a strange status—I handed it out, then shortly afterwards said that all the NPs we’d seen before should actually be considered DPs.

Following the principle that a homework generally covers material up to the class during which it was handed out, you can use NPs on HW6.

But, on the other hand, feel free to use DP instead. The difference between them will not be something that the grader will be instructed to look at. And, it’s probably just as well that you start getting used to using DPs. So, I’d recommend using DP, but will also accept NPs, on HW6.

On future homework: DPs, all the time.