Each week, of people who wear home-made masks switch to store-bought masks, while the other stick with their home-made masks. At the same time, of people who wear store-bought masks switch to home-made masks, while the other continue to buy masks from a store. The function that maps the number of people who wear home-made masks and the number of people who wear store-bought masks this week, to the number of people wearing home-made masks and the number of people wearing store-bought

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