Write these functions in ML(SML) : Write a function dup to double each element of an integer list. One function only. dup([2,3,5]) → [2,2,3,3,5,5] Write a function dups to double each char of a string. Recursion must on list not string. dups("aabc") → "aaaabbcc" Write a function mid to keep elements of an integer list between 5 and 10. One function only. mid [12,3,6,4,5,1] → [6,5]

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