Write a Boolean function called $$that takes a list as input and returns True if there is any element that appears more than once and False otherwise. It should not modify the original list.

Write a function called $$that takes a list and returns a new list that contains the same elements as the input list except that any duplicates are removed.$$ Your function should NOT modify the input list. For example if x references the list $[5,2,3,5,5,3]$ then $,$ should return a list with the elements $5,2$ and $3.$ Note that they can be in any order $($e$.$g$.,[5,2,3]$ or $[2,5,3]).$However$,$ the original list x should still be in the same order $[5,2,3,5,5,3].$

Write a function called $$that takes a list and modifies the list so it contains only the unique elements from the original. Your function SHOULD modify the input list. For example if x references the list $[5,2,3,5,5,3]$ then after$,$ the list x should contain the elements $5,2$ and $3.$ Note that they can be in any order $($e$.$g$.,[5,2,3]$ or $[2,5,3]).$Note too that this function does not return anything, but simply modifies the input list.