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Let's consider a final example.
Case study: Alisha is a 22 year old university student. Her parents have given her a house in Melbourne, Australia. The house has four bedrooms and two bathrooms. Alisha invites three of her friends, Ben, Carlos and Debra, who are also students, to share the house with her. Alisha, Ben, Carlos and Debra all promise to take weekly turns at cleaning the kitchen and putting out the garbage. Click on the table below to identify the kind of rule that governs these promises.
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