similarities = reference_set.intersection(to_check_set)

percentage_of_similarity = len(similarities)/len(to_check_set)*100

if percentage_of_similarity > 75:
    print('Percentage similarity:' , percentage_of_similarity, '. Your text file is too similar to the source file!')
else:
    print('Percentage simlarity:' , percentage_of_similarity , '. You Passed the Plagiarism test!')