Using this mode it can be easily (using 3 keystrokes … it’s Emacs) to PDF or HTML to make it more readable (and add a table of contents). Please don’t try to “beautify” it with any other text editor ...
Hebbian weighting: every real use bumps a card's used counter, so frequently-used knowledge floats up to hop 0 of retrieval; Mechanical audits: contradictory edges, orphan cards, is-a cycles, ...