Describe a vignette as a genre to someone who has never heard of it.

A vignette is a short, descriptive scene. ... Vignettes are intended to leave an impression on the audience's mind. You might find a vignette in works of fiction or nonfiction, essays, films, and theatrical scripts. It'll focus on a particular moment and provide more information about a character, theme, mood, or idea.

Explanation:

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in "letter from a birmingham jail," king argues that there are four basic steps in any nonviolent campaign: "[c]ollection of the facts to determine whether injustices exist; negotiation; self purification; and direct action." finally, direct action is taken and acts such as boycotts and sit-ins are staged.