'Once upon a midnight dreary, while I pondered, weak and weary,
Over many a quaint and curious volume of forgotten lore,
While I nodded, nearly napping, suddenly there came a tapping,
As of some one gently rapping, rapping at my chamber door.
"Tis some visitor," I muttered, "tapping at my chamber door -
Only this, and nothing more." '
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                        Edgar Allan Poe, "The Raven"