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please and please respond as soon as possible 19. What are the two characteristics of a tuple? 20. What is the Cartesian product A 21.

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19. What are the two characteristics of a tuple? 20. What is the Cartesian product A 21. How do lists differ from tuples? 22. What is a string? 23. What is a language? 24. What does concatenation mean? 25. What is the product LM of two languages L and M? 26. If A is an alphabet, what is A*? 27. If Lis a language, what is L+? 28. What is a relation? 29. What is a binary relation? 30. What is the product rule for counting

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