examiners = submissionSet.examiners_by_exercise.get(exercise_id, [])
marks_by_examiner = submission.get_exercise_marks_by_examiner(exercise_id)
for examiner in examiners:
examiners = submissionSet.examiners_by_exercise.get(exercise_id, [])
marks_by_examiner = submission.get_exercise_marks_by_examiner(exercise_id)
for examiner in examiners: