Which parts of this excerpt from Edgar Allan Poe's "The Cask of Amontillado" use irony?


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"Come," I said, with decision, "we will go back


You are rich, respected, admired, beloved; you are happy, as I once was


We will go back; you will be ill


"the cough's a mere nothing; it will not kill me. I shall not die of a cough."


"True--true," I replied; "and indeed, I had no intention of alarming you unnecessarily