/usr/share/XaoS/tutorial/filter.xaf is in xaos 3.5+ds1-3.1+b2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | ; An introduction to fractals by Jan Hubicka
; Version 1.0 done for XaoS 3.0 in July 1997
; Use xaos -play to see it :)
(load "head.xhf")
(clearscreen)
(message "filter")
(usleep 4000000)
(load "filter.xhf")
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