The technique known as "Repetition of the word" was used by Poe in this passage to help develop the narrator’s character.
This refers to the act of simply repeating a word within a short space with no particular placement of the words to secure emphasis
Hence, from the excerpt "I blush, I burn, I shudder, while I pen the dam-nable atrocity" Poe is using the Repetition of the word "I" technique to help develop the narrator’s character.
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