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  1. or download this
    New York/York/Boston => New York/Boston
  2. or download this
        1 while s{
      (/|^)   # add: capture slash or start of string: $1
...
      )
    }
    {$1}gx;  # add: replacement
  3. or download this
     1 while s#(/|^)((?>[^/]*))/(?=(?:.*?/)?\2(?:/|$))#$1#g;