old_contents: def round_scores(student_scores):
      """Round all student scores in the provided list.
  
      :param student_scores: list of student exam scores as float or int.
      :return: list of student scores *rounded* to nearest integer value.
      """
  
      pass
  
  
  def count_failed_students(student_scores):
      """Count the number of failing students in the provided list.
  
      :param student_scores: list of integer student scores.
      :return: integer count of student scores at or below 40.
      """
  
      pass
  
  
  def above_threshold(student_scores, threshold):
      """Count the number of student scores and determine how many performed the best based on the provided threshold.
  
      :param student_scores: list of integer scores
      :param threshold :  integer
      :return: list of integer scores that are at or above the "best" threshold.
      """
  
      pass
  
  
  def letter_grades(highest):
      """Create a list of grade thresholds based on the provided highest grade.
  
      :param highest: integer of highest exam score.
      :return: list of integer lower threshold scores for each D-A letter grade interval.
               For example, where the highest score is 100, and failing is <= 40,
               The result would be [41, 56, 71, 86]:
  
               41 <= "D" <= 55
               56 <= "C" <= 70
               71 <= "B" <= 85
               86 <= "A" <= 100
      """
  
      pass
  
  
  def student_ranking(student_scores, student_names):
      """Create a list of strings that contain the student's rank, name, and grade in ascending order.
  
       :param student_scores: list of scores in descending order.
       :param student_names: list of names in descending order by exam score.
       :return: list of strings in format ["<rank>. <student name>: <score>"].
       """
  
      pass
  
  
  def perfect_score(student_info):
      """Create a list that contains the name and grade of the first student to make a perfect score on the exam.
  
      :param student_info: list of [<student name>, <score>] lists
      :return: first `[<student name>, 100]` or `[]` if no student score of 100 is found.
      """
  
      pass
  
new_contents: def round_scores(student_scores):
      """"Round all provided student scores.
  
      :param student_scores: list of student exam scores as float or int.
      :return: list of student scores *rounded* to nearest integer value.
      """
  
      pass
  
  
  def count_failed_students(student_scores):
      """Count the number of failing students out of the group provided.
  
      :param student_scores: list of integer student scores.
      :return: integer count of student scores at or below 40.
      """
  
      pass
  
  
  def above_threshold(student_scores, threshold):
      """Determine how many of the provided student scores were 'the best' based on the provided threshold.
  
      :param student_scores: list of integer scores
      :param threshold :  integer
      :return: list of integer scores that are at or above the "best" threshold.
      """
  
      pass
  
  
  def letter_grades(highest):
      """Create a list of grade thresholds based on the provided highest grade.
  
      :param highest: integer of highest exam score.
      :return: list of integer lower threshold scores for each D-A letter grade interval.
               For example, where the highest score is 100, and failing is <= 40,
               The result would be [41, 56, 71, 86]:
  
               41 <= "D" <= 55
               56 <= "C" <= 70
               71 <= "B" <= 85
               86 <= "A" <= 100
      """
  
      pass
  
  
  def student_ranking(student_scores, student_names):
      """Create a list of strings that contain the student's rank, name, and grade in ascending order.
  
       :param student_scores: list of scores in descending order.
       :param student_names: list of names in descending order by exam score.
       :return: list of strings in format ["<rank>. <student name>: <score>"].
       """
  
      pass
  
  
  def perfect_score(student_info):
      """Create a list that contains the name and grade of the first student to make a perfect score on the exam.
  
      :param student_info: list of [<student name>, <score>] lists
      :return: first `[<student name>, 100]` or `[]` if no student score of 100 is found.
      """
  
      pass
  
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