Just saving the screenshots for now
mDecks Pro’s analysis:

LEGO by Bob Keller:

LEGO in John Elliott’s book:

https://diglib.eg.org/bitstream/handle/10.2312/evs20221102/109-113.pdf:


HookPad:


https://compmus.ime.usp.br/sbcm/2007/papers/sbcm-2007-15.pdf
https://github.com/vpavlenko/changes