All freshmen take first year of studies. They have some choice:
Course 1: Writing and Rhetoric or University Seminar: one in fall semester, the other in spring semester
Course 2: Mathematics: both fall and spring semester
Course 3: Science: both fall and spring semester
Course 4: University Requirement or Elective: one in fall semester, the other in spring semester
Course 5: Program Requirement or Elective: one in fall semester, the other in spring semester
http://firstyear.nd.edu/current-students/courses-for-first-years/
They all freshman?
I admit I didn’t read the original article that closely.