Simple things

Simple mistakes in painful textbooks or other study resources, unless it distorts the comprehension of the learning process, should be considered mandatory so long as it provides humorous content to break the tedium, and to lower stress levels for the benefit of the mental health of students everywhere.

And by this I mean:

(b) Explain why the resulting fagmentation (EMP1, EMP2) does not fulfill the correctness rules of fragmentation.

Fagmentation indeed.