His page numbers are zero indexed. Cute. I would have loved to take his proposal for an introduction to computer science course.
"And with the sixth example I have reached imperceptibly but unavoidably,
the most hairy part of this talk: Educational consequences."
which is incorrect as item 6 is actually the 7th example. Zero based
indexing requires that the counter be updated after appending and the counter
be referenced for the cardinal value of an item.
(ie. item 6 is 7th in the list).