08 Closure Properties of Regular Languages

Picked one by one from a mixed channel. Transcript check: both title readers certain; 5 of 5 sampled certain picks confirmed by transcript, none failed. Channel rule: Include only numbered course lecture and tutorial videos (titles like 'W#_L#:', 'L#:', '(Lecture N)', 'N.N :' or 'N. <topic>') that teach a specific subject. Exclude testimonials, promos, fest/event recordings, club sessions, level/course intro videos and long live practice or activity sessions.