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  1. or download this
    cat in

ID1 nick-john-helena
ID2 george-andreas-lisa-anna-matthew-andreas-lisa
ID3 olivia-niels-peter-lars-niels-lars-olivia-olivia
  2. or download this
    perl -MList::Util=uniq -ple '
  s/
...
     $1          # 1: n1-n2-n1-n3
   /xe           # Freespace regex and eval replacement.
' in
  3. or download this
    ID1 nick-john-helena
ID2 george-andreas-lisa-anna-matthew
ID3 olivia-niels-peter-lars