Returns a dictionary whose keys are included words $($as is$),$ and values are lists of unique

successors to those words. The first word of the txt file is always a successor to $".".$ Be careful with

punctuation. You can assume the text in the txt file does not contain any contraction words $($isn$$t$,$

don$$t$,$ I$$m$,$ etc$)$ but you cannot make assumptions about the spacing or the presence of nonalphanumerical characters. The starter code already contains the code to read the txt file, just make

sure the file is in the same directory as your $.$py file. You must write your code after the file has

been read to process the contents.