> Also, it should be computationally infeasible to find any other word which also hashes to [...] He knows there are collisions, he just chose to start with th

> Also, it should be computationally infeasible to find any other word which also hashes to [...] He knows there are collisions, he just chose to start with the simplest explanation and add the useful details as he moves on. It's fine by me, even though engineers tend not to like that (they prefer accuracy from the word go).