What is one way in which edgar allan poe creates a unity of effect of melancholy in "the raven"?

There are several ways in which Edgar Allan Poe creates a unity of effect of melancholy in "The Raven." The most obvious way in which he does so is through the repetition of the word "nevermore." The repetition creates a sense of rhythm and consistency.

Another way in which he achieves this is through the use of imagery that is consistent throughout the poem. This includes the use of dark images that create a feeling of suspense and melancholy.

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