You have been working at Mr Lovebird’s Pet Emporium over the summer to earn some money while waiting to start studying for your genetics degree. Suddenly you receive a tweet. Mr Lovebird is in a flap. It has been a disastrous night. Someone forgot to close the aviaries housing the prize-winning budgies, and when Mr Lovebird arrived at the shop early in the morning, a scene of utter chaos confronted him. Budgies were everywhere! The budgies are Mr Lovebird’s pride and joy and he is mortified. He blames you, threatening to terminate your employment.
In an effort to placate Mr Lovebird, you help clear up the mess. He insists you return each bird to its own aviary. He explains in great detail what you need to do. You realise that he is still very angry with you. Assigning each budgie to the correct cage is not a problem as there are simply four colour types: green, blue, yellow and white (see Figure 1). You spend the whole day putting everything to rights, and even Mr Lovebird is forced to concede that you have done a fantastic job. Within a few days Mr Lovebird has calmed down, and you are delighted when he withdraws his threat to dismiss you.
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