There doesn’t seem to be a difference in the notion of independence between GENRE ->> TITLE_GENRE <<-- TITLE, and ACTOR -->> TITLE_ACTOR <<-- TITLE. Eliminating the title does not eliminate the actor nor the genre, and likewise for eliminating the actor or genre does not eliminate the title. TITLE_GENRE does’t explicitly include the primary key designation the way the TITLE_ACTOR model does. This seems to fly in the face of earlier statements defining the independence of relationships based on primary key.emphasised text