The definition that closely matches the use of vast in "She Unnames Them." is (adj.) of very great extent or quantity; immense.
The biblical narrative of Genesis, in which Adam names the animals, serves as the inspiration for the flash fiction piece "She Unnames Them." Subscribers to "The New Yorker" can access the story's initial 1985 appearance there. There is also a free audiobook version of the author reading her work.
A justification of the right to self-determination is made in "She Unnames Them." "The issue was precisely one of individual choice," Eve tells the cats. It is also a tale about removing obstacles. Therefore, you would need to search your text (or book, or whatever) for a sentence that means "extremely big extent or amount," and then use it to create your statement describing how you arrived at your conclusion.
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