" One of the things Ford Prefect had always found hardest to understand about human beings was their habit of continually stating and repeating the very very obvious, as in
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At first Ford had formed a theory to account for this strange behaviour. If human beings don't keep exercising their lips, he thought, their mouths probably seize up. After a few months' consideration and observation he abandoned this theory in favour of a new one. If they don't keep on exercising their lips, he thought, their brains start working. "
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