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Use "circulars" in a sentence
"They're featured in circulars that were included in Sunday newspapers."
"It has always bugged me to see car dealers displaying huge flags for holiday sales, political candidates featuring flags on campaign signs, supermarkets placing flags in circulars, etc."
"Best Buy plans to advertise the availability of the iPhone, as well as the new accessory packs, in circulars across the USA on Sunday."