left pad by tails

:
s/\x01/\x029876543210&9\x02/
s/\(.\)\x02.*\1\(\x01*.\).*\x02/\2/
t
s/.*\x09./&\x09/
/\x09$/s/./&&/
s/ \w\+/&\x01\x09/
/ 0*\x01/!b
s/. \w*\x01\x09* \|\x09//g

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

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