h s/\(.\).*/&\1/p s/./ /g G s/\S.*/&&/ : /.\(.*\).\n.\(.\)\(.*\)\(.\)/{s//\4\1\2\n.\3/ P} t s/.*\n.// G :0 s/\(\n.*\)\(.\)/\2\1/ t0
Note that non-ascii characters in the above source code will be escaped (such as \x9f).
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