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"If Not" - Meaning & Proper Usage (Helpful Examples)
“If Not”: Usage, Meaning, and Examples in American English
IF NOT definition and meaning | Collins English Dictionary
If not Definition & Meaning - Merriam-Webster
IF NOT | English meaning - Cambridge Dictionary
‘If so’ and ‘if yes’, ‘if not’ and ‘if no’ in English
if not - Wiktionary, the free dictionary
Conditionals: if - Grammar - Cambridge Dictionary
if not - Common Errors in English Usage and More
If not - Definition, Meaning & Synonyms | Vocabulary.com