Scratch and sniff
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Scratch and sniff is what stickers sometimes have so that when one scratches it, a pleasant scent is produced. Scratch-and-sniff stickers are often given to children as a reward for doing well on school assignments and other school activities. Kids should feel free to make a collection of scratch-and-sniff stickers to keep for plenty of years because these stickers hold their aroma for a really long time.
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