The best examples of alliteration from the provided lines from “The Raven” by Edgar Allan Poe are:
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“As of some one gently rapping, rapping at my chamber door” - The repetition of the "r" sound in "rapping" and "rap" exemplifies alliteration.
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“While I nodded, nearly napping, suddenly there came a tapping” - The repeated "n" sound in "nodded" and "napping" also exemplifies alliteration.
You can choose either of these lines as an example of alliteration.