(i) Code in SML a function removeFirst 'a'a list -'a list that removes from the given list the first occurrence of the given value (if it occurs there at all), but keeps all later occurrences removeFirst 5 [1,5,3,4,3,5,5,7]; val it- [1,3,4,3,5,5,7] : int list (ii) Code a function remove : ,a-> , a list-> ,a list that rem oves from the given list all occurrences of the given value - remove 5 [1,5,3,4,3,5,5,7] val it - [1,3,4,3,7] : int list (iii) Use remove to code a function nub : , , a list ' a list that makes the given list duplicate- free by keeping only the first occurrence of each value in the list. - nub [1,5,3,4,3,5,5,7]; val t = [1 ,5 , 3, 4, 3,7] : int list