Shorter Roman Numerals by tails

:
s/\s/<<1234569 01>/
s/\(.\)<.*\1\( *.\).*>/\2/
t
h
:2
s/0//
T3
s/[2469]//
t2
g
/3/!p
:3
z
H
g
/3000/!b

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

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