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Twice

Language/Type: C# List collections Twice
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Write a method named Twice that accepts a List of strings as a parameter and that appends a second occurrence of the entire list to itself. For example, if a List named list stores the values {"how", "are", "you?"}, the call of Twice(list); should modify the list to store {"how", "are", "you?", "how", "are", "you?"}.

Method: Write a C# method as described, not a complete program or class.

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