Angela remembers a dream in which she boarded a train that entered a dark tunnel. according to freud's psychoanalytic theory, the dream images that angela remembers, such as the train and the tunnel, are called the content. manifest repressed sublimated latent

I believe the answer is: manifest content

Manifest content refers to the actual objects that appear on the dream without considering the underlying meaning of the object.
Manifest content that appear in our dream could only be created from the images that we already stored in our memory.

Complementary goods. they go together, thats why one price increase and the others demand increases