falling number by KirarinSnow

s/^/9\n>0123456789/
:
s/9\n/\n0/
t
s/^\n/0\n/
s/\(.\?\)\n\(.*\)\(>.*\1\(.\)\)/\4\2\n\3/
/^9\?8\?7\?6\?5\?4\?3\?2\?1\?0\?\n/P
/0000/Q
b

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

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