<wob_jonas> slashlearn b_jonas can\'t spell//b_jonas can\'t spell these words: weird, hygiene, etymology, myopia, hibernate, carbohydrate, appearance, maintenance, appropriate, privilege, obsolete, heard, homogeneous, jealous; and confuses these sets of words: drought, draught/draft; couch, coach; depreciate, deprecate; dilate, dilute; contiguous, continuous; d

http://www.madore.org/~david/math/hydra0.xhtml , dire: http://www.madore.org/~david/math/hydra.xhtml , theory: http://www.madore.org/~david/weblog/d.2008-03-27.1537.html http://www.madore.org/~david/weblog/d.2008-03-16.1534.ordinaux-et-hydres.html http://math.andrej.com/2008/02/02/the-hydra-game/ https://en.wikipedia.org/wiki/Goodstein%27s_theorem