https://git.9front.org/plan9front/plan9front/26f0aa33d91442fc7a56fc5f5c9b56b5f5f84ce2/lib/theo/f.html
https://github.com/enukane/9front-work/blob/master/lib/theo
https://git.9front.org/plan9front/plan9front/26f0aa33d91442fc7a56fc5f5c9b56b5f5f84ce2/lib/theo/f.html