Merge Digits by tails

s/.*/ &z=9876543210z/
:
/\( .*\)\(.\).*\1\(.\).*=.*\2.*\3/!s/ \(.* \)\(\w\)/ \2\1/
s/ \(.\)/\1 /
s/  z.*//
t

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

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