This is a case of a really believed legend of diablerie becoming the source of a literary fiction. [Please select]
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"This is Avery in her everyday mood--sweet and kind and reasonable,--the Avery we all know and love--with just a hint of what the French call _'diablerie'_ to make her--_tout-à-fait adorable_." [Please select]
Do you have a better example in your mind? Please submit your sentence!