permission list by %20

s/^/0000 is -RWXRWXRWX/
:0
h
s/[RWX]/-/gp
g
s/ /~ /
:
s/~/<1234567~01>/
s/\(.\)<.*\1\(~*.\).*>/\2/
t
s/.[rwx]*$/\U\l&/
/777/!b0

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

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