adnd method rolling system odds - SERP Analysis

https://www.dragonsfoot.org/forums/viewtopic.php?t=48623

https://www.reddit.com/r/rpg/comments/4l3hcf/add_1st_ed_what_is_the_percentage_chance_of/

https://rpg.stackexchange.com/questions/153527/what-are-the-odds-of-rolling-specific-ability-score-totals-in-dd

http://grognardia.blogspot.com/2010/06/ad-most-enduring-rule.html

https://rpg.stackexchange.com/questions/48285/is-it-better-to-take-the-array-and-be-joe-average-or-to-roll-for-the-odds-of-ge

https://www.quora.com/What-is-the-method-for-calculating-probabilities-in-Dungeons-Dragons-D-D-when-using-dice-rolls-and-rerolls

https://www.enworld.org/threads/setting-the-method-for-rolling-ability-scores.693061/page-3

http://lordgwydion.blogspot.com/2024/01/what-to-roll-and-which-system-to-use.html

https://forums.giantitp.com/archive/index.php/t-508244.html

https://www.therpgsite.com/pen-paper-roleplaying-games-rpgs-discussion/add-stat-generation-methods/