You are given a dictionary aDict that maps integer keys to integer values. Write a Python function that returns a list of keys in aDict that map to dictionary values that appear exactly once in aDict. This function takes in a dictionary and returns a list. Return the list of keys in increasing order. If aDict does not contain any values appearing exactly once, return an empty list. If aDict is empty, return an empty list. For example: If aDict

Implement a document scanning function wordcountengine, which receives a string document and returns a list of all unique words in it and their number of occurrences, sorted by the number of occurrences in a descending order. if two or more words have the same count, they should be sorted according to their order in the original sentence. assume that all letters are in english alphabet. you function should be case-insensitive, so for instance, the words “perfect” and “perfect” should be considered the same word.