The following function open_file() opens a file called 'example. txt' and returns the file pointer. This function is called within main and the file pointer is used to read lines in the file. Create a dictionary called 'dict_of_words' that have words as 'keys' and (integar) counters as values. The counter values keep a count of the number of times a word has appeared in the text file. In the end, store the dictionary key, values in a list, sort and print the list on the screen. Note that the counts are not case-sensitive, that is, 'Word' is the same as 'word' or 'wORd'.