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Language/Type: C# Dictionary collections
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Write a method LeastCommon that accepts a Dictionary whose keys are strings and whose values are integers as a parameter and returns the integer value that occurs the fewest times in the dictionary. For example, if a dictionary named m contains {{"Alyssa", 22}, {"Char", 25}, {"Dan", 25}, {"Jeff", 20}, {"Kasey", 20}, {"Kim", 20}, {"Mogran", 25}, {"Ryan", 25}, {"Stef", 22}}, the call of LeastCommon(m) returns 22. If there is a tie, return the smaller integer value. If the dictionary is empty, throw an ArgumentException.

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

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