In the
http://ai.neocities.org/MindBoot.html of the first working artificial intelligence programs -- which use concepts to think in English and sometimes Russian -- the otherwise alphabetical MindBoot sequence starts with the English word "ERROR". The first working AI software "fails gracefully" by including the word "ERROR" in any misconceived thought, so that the AI mind
http://ai.neocities.org/maintainer.html in charge of troubleshooting and debugging the mission-critical AI installation will recognize immediately that something has gone wrong in the "Psy" conceptual array. Upshot: "failing gracefully" is ultra-important to AI sysadmins and AI Mind Maintainers.