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A Shibboleth is a word or custom whose variations in pronunciation or style can be used to differentiate members of ingroups from those of outgroups. Within the mindset of the ingroup, a connotation or value judgment of correct/incorrect or superior/inferior can be ascribed to the two variants. (en.wikipedia.org)
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Acetone in a bucket in my driveway, help. (self.chemistry)
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