in c# Write a console app that inputs a sentence from the user (assume no punctuation), then determines and displays ONLY THE DUPLICATE words in alphabetical order. Treat uppercase and lowercase letters the same. [Hint: You can use string method Split with no arguments, as in sentence.Split(), to break a sentence into an array of strings containing the individual words. By default, Split uses spaces as delimiters. Use string method ToLower before calling Split.]

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Array

The simplest way to start thinking about an array is as a collection, or a set of elements. In programming, these elements may be constants, variables, functions and pointers.