A common problem in academic settings is plagiarism

detection. Fortunately, software can make this pretty easy!

In this problem, you'll be given two files with text in

them. Write a function called check$\_$plagiarism with two

parameters, each representing a filename. The function

should find if there are any instances of $5$ or more

consecutive words appearing in both files. If there are,

return the longest such string of words $($in terms of number

of words, not length of the string$).$ If there are not,

return the boolean False.