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Why use "need not" instead of "do not need to"?
How To Use “Need Not” In A Sentence: Usage and Examples
NEEDN'T | English meaning - Cambridge Dictionary
need not - Wiktionary, the free dictionary
NEEDN'T definition and meaning | Collins English Dictionary
Need - English Grammar Today - Cambridge Dictionary
NEEDN'T definition in American English - Collins Online Dictionary
Needn't Definition & Meaning - Merriam-Webster
needn’t - Oxford Learner's Dictionaries
Need/Needn't: Correct Uses of Need and Needn't Examples