Not a preview of Volume 4 (Score 1)

This isn't really a preview of Volume 4: Combinatorial Algorithms. It's an "Addendum to Volume 1 (tutorial on MMIX)" as stated on Knuth's TAOCP page under Errata for Volume 1. Knuth's TAOCP page = http://sunburn.stanford.edu/~knuth/taocp.html