https://youtu.be/ux6TVYqdN-E?t=3707

with context... Q. from classroom...
https://youtu.be/ux6TVYqdN-E?t=3303

with context... end of the part before the question...
https://youtu.be/ux6TVYqdN-E?t=3006

excerpt.. https://www.youtube.com/watch?v=17fRzsbcME0