Plan 9 from Bell Labs’s /usr/web/sources/contrib/fgb/root/sys/src/cmd/4th/lib/choose.4th

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\ 4tH library - CHOOSE - Copyright 2004,2007 J.L. Bezemer
\ You can redistribute this file and/or modify it under
\ the terms of the GNU General Public License

[UNDEFINED] NULL [IF]
include lib/null.4th
[THEN]

[UNDEFINED] CHOOSE [IF]
: MANY   0 begin over over th @c NULL <> while 1+ repeat nip ;
: CHOOSE random * max-rand 1 [+] / ;
[THEN]

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