falling number by %20

s/^/10/
:
s/-/<<123456789-01>/
s/\(.\)<.*\1\(-*.\).*>/\2/
s/\(.\)\1/\1-0/
t
/9876/q
p
s/$/-/
b

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

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