Once upon a time there were three bearsa papa bear, a mama bear and a baby bear. Papa bear liked his porridge very, very hot. Mama bear liked her porridge "just hot." Baby bear liked his porridge only warm. But it was quite impossible for cook to make three kinds of porridge every morning. So cook made up a batch of porridge that was the same temperature as if she had made some veryvery hot porridge, some just-hot porridge, some only-warm porridge, and mixed them together. Papa bear grumbled that it wasn't right....
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