Every professor should have a procedural problem generator that takes a seed number input and creates an entire, unique assignment, with a grading guide generat

Every professor should have a procedural problem generator that takes a seed number input and creates an entire, unique assignment, with a grading guide generator that operates from the same seed to demonstrate the "correct" steps to reach the solutions for the assignment. That is something you could literally write once and continue to use for 100 years, tweaking only when the course requirements change. Even if you're lazy, and write all the questions and solution guides by hand, you could still select from every such question that you had ever written, and by your 20th year on the job, memorizing from the bootleg study guides would be harder than just learning the course material.