This is a quote from the book "Animal Farm" by George Orwell
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“It says, ‘No animal shall sleep in a bed with sheets,”’ she announced finally.

Curiously enough, Clover had not remembered that the Fourth Commandment mentioned sheets; but as it was there on the wall, it must have done so. And Squealer, who happened to be passing at this mom ent, attended by two or three dogs, was able to put the whole matter in its proper perspective.

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