Read the following paragraph and answer the question.
1Poe really was the inventor of the detective story, which he called the "ratiocinative" tale. 2Here believing the effect intended was "to perplex the reader and whet his desire for elucidation," he originated two devices useful to this day. 3One might be called "the device of the baffled friend": He gave his brilliant detective a companion not good at solutions and had him tell the story. 4Viewing the happenings through this narrator's eyes, the reader shares his growing puzzlement.

Question

Read the following paragraph and answer the question.
1Poe really was the inventor of the detective story, which he called the "ratiocinative" tale. 2Here believing the effect intended was "to perplex the reader and whet his desire for elucidation," he originated two devices useful to this day. 3One might be called "the device of the baffled friend": He gave his brilliant detective a companion not good at solutions and had him tell the story. 4Viewing the happenings through this narrator's eyes, the reader shares his growing puzzlement.

anonymous · Answer

last part of sentence 5 and questions.  
He had the detective disclose his surprising solution and then "elucidate" step by step the reasoning which led to it. 6"The Purloined Letter" demonstrated Poe's use of these two devices in a detective story.

what are three of the key words in Sentence 3.
What are two of the key words of Sentence 6.
what ae the essential words which must be included in a paragraph summary of Sentences 1-6.