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Social Studies, 21.02.2021 02:50 gladtobesmart123

When Ruby practice piano she gets a sticker, and when she does a chore she gets 2 stickers. When she has 20 stickers her parents will buy her a
pizza as reward. This system is called?

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When Ruby practice piano she gets a sticker, and when she does a chore she gets 2 stickers. When sh...
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