Move To Front Encode by tails

s/^/ 0123456789;/
:
s/\s\(.*\)\(.\)\(.*;\)\2/ \19876543210\n\2\1\3/
s/ .\{9\}\(.\)\w*/\1/
t
P;Q

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

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