"Have you heard of the AHA difference?" "AHA difference? I don't even know what that is, much less heard of it!" - local radio ad for pet lathroscopic spaying, AHA is an acronym for something or other.
This implies that one could be expected to know what it is without having heard of it. Usage fail.
This implies that one could be expected to know what it is without having heard of it. Usage fail.
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For example, there is some questionable grammar in the sentence; the past participle heard doesn't have the accompanying form of have that it requires; or, more broadly, in this context, much less only licenses a verb phrase with a verb in plain form, e.g. much less make a coherent statement.
Not everything wrong with an utterance is grammatical in nature.
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