/Q-->/D D-->W in the 7sage lesson, the teacher said /Q-->/D and /W-->/D, thus, there's no inference made. However, isn't we also can do it like D-->Q and D-->W, thus, some Q are W?
This is my biggest problem at the moment, and I don't recall this being in the curriculum. Could someone point this lesson out if I'm missing it? Seems like a pretty big part of the test.