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the open-content textbooks collection that anyone can edit.
3,069 books with 83,586 pages
 Formal Logic is a study of inference with purely formal content. The first rules of formal logic were written over 2300 years ago by Aristotle and are still vital to many modern disciplines like Linguistics and Computer Science.
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 Children can explore all the letters of the alphabet in Alphabet.
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 The Au Jus sandwich, also known as a French Dip sandwich or Roast Beef Au Jus, traces its origin to a restaurant in downtown Los Angeles in 1918, when a local restaurant owner was making a sandwich for a police officer and accidentally dropped a French roll into a pan containing beef drippings.
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