First Derangement by mitchs (rotary-o)

#!ruby -pa
s=*$F
gsub(/./){s[c=s.chars.min_by{|c|c[$&]?2:s[($_+s).count c]?1:$&<=>c}]=''
c}

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

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