Write a Scheme program that takes a list of numbers as input. The function should produce...

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Write a Scheme program that takes a list of numbers as input. The function should produce as output the number of items in the list that are unique. So, the list (red blue red blue yellow) should produce 3 as output. This program must be submitted in a text file. Write a Scheme program that takes a list of numbers as input. The function should produce as output the number of items in the list that are unique. So, the list (red blue red blue yellow) should produce 3 as output. This program must be submitted in a text file.