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basic
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cat noise
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condition
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duty
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essential
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imperative
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inferior
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must
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necessary
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necessity
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obligation
0
prerequisite
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requirement
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requisite
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APASmart Define. (2015). woof thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/woof/thesaurus/antonyms
ChicagoSmart Define. 2015. "woof thesaurus" https://smartdefine.org/woof/thesaurus/antonyms (accessed September 24, 2026).
HarvardSmart Define 2015, woof thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/woof/thesaurus/antonyms>.
MLASmart Define. "woof thesaurus" 8 November 2015. Web. 24 September 2026. <https://smartdefine.org/woof/thesaurus/antonyms>