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Rule "if or not (whether or not)"

This is one of many errors that LanguageTool can detect.

Description:	if or not (whether or not)
Message:	This is a non-standard phrase. Did you mean <suggestion>whether or not</suggestion>?
Category:	Grammar (ID: GRAMMAR)
Link:	https://languagetool.org/insights/post/whether-vs-if/#when-to-use-%E2%80%9Cwhether%E2%80%9D
Incorrect sentences that this rule can detect:	It's not certain whether communication with the site's customer service has led it to be clear if or not this is true. Correction suggestion: whether or not
ID:	IF_OR_NOT [1]
Version:	6.6-SNAPSHOT (2024-11-25 22:33:08 +0100)

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