Grundzüge der Mengenlehre is a book on set theory written by Felix Hausdorff.
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{"fact":"At 4 weeks, it is important to play with kittens so that they do not develope a fear of people.","length":95}
{"slip": { "id": 89, "advice": "Don't be afraid to ask questions."}}
{"slip": { "id": 4, "advice": "Cars are bad investments."}}
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