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the open-content textbooks collection that anyone can edit.
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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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Pesto is a sauce that originates in the city of Genoa in the Liguria region of northern Italy (pesto alla genovese). It can be used as a sauce for pasta or meat, or can be used as an ingredient in a variety of dishes. One classic use is to spread the pesto onto slices of bread which are then toasted.
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