falling number by tails

s/^/==\n===\n====/
:
s/.*<>.*\n*\|\(\(.\)<.*\)\2\w*/\1/m
s/\(.*\)<\(.\)\(.*>\)\(.*\)/\1\2\4\n\1<\3\4/m
t
s/=/<0123456789>/
t

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

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